quadrilaterals Venn Diagram

Final exam guide

Chapter 4 (Polygons)

Video

Web Site

http://www.learner.org/courses/learningmath/geometry/session3/part_a/index.html

http://www.mathleague.com/help/geometry/polygons.htm

http://www.math.com/tables/geometry/polygons.htm

Chapter 5 (Area)

Video

This video just covers the Area of a Trapezoid, but the other videos on the right cover the rest

of the material we learned form this chapter.

Web Site

This site covers all of the things we learned, but the last few things at the bottom of the page

we did not cover, so disregard them.

http://library.thinkquest.org/20991/geo/area.html

Venn diagram

Here are four examples of complementary and supplementary angles. You can see here how complementary angles add up to be 90 degrees and supplementary angles add up to be 180 degrees. Use the four examples to solve for the unmarked angles and look at the writing in the red to check your answers.

Finals time approaches

Hey all,

In Friday's class we worked in our small groups on our "final assignment." In my group we are making a problem that uses proportions to find the lengths of sides of shapes - from chapter 7. We are making one big massive problem that will be awesome!

Don't forget: your assignments must be posted on the blog by the end of Monday!!

As finals time approaches, here are some helpful tips:

- if you are behind in any of your classes, get those assignments completed this weekend, once those are done, even if you aren't completely on top of your studying for your finals, you will feel 10 times better.

- If you get those last assignments completed this weekend, or if you are already on top of everything....get studying!! If you get on top of your studying for finals this weekend next week with go by in a giff :). Just keep telling yourself one more week!...go out with a bang.

- tips for studying:

* go through your old tests and quizzes to see what you remember

*review homework and notes from sections you don't remember very well

*do some problems from your tests and homework (make sure you do at least one from every section and topic covered in the chapters).

* if you totally don't know something, go back to the book and your notes and relearn what you forgot

* Also, it is really helpful to make a study guide for all chapters with key notes to remember from the chapter. Or you can make practice tests from homework problems (just make sure you have the answers! so you can check)

- Other things to keep in mind:

1.) DON'T get too stressed, that won't do you any good

2.) get good sleep this coming week, especially the nights before the finals, no matter how much you study, if you don't get enough sleep you will do poorly on your finals

3.) Eat protein enriched foods this week, they will really help you to keep going strong this week.

4.) And finally, take breaks during your studying to exercise, be it running around the block, around your house, doing jumping jacks or just hoping around your room, exercise really helps your brain keep working efficiently.

MATH final help:

1.) come to Panera this sunday at 5pm to study with your fellow classmates

2.) look at the blog to refresh your mind

3.) watch this video to review math concepts:

(ignore the creepy guy with the rat tail and lowcut shirt :P )

YouTube - Algebra: Formulas From Geometry

file:///Users/Emma/Desktop/YouTube%20-%20Algebra-%20Formulas%20From%20Geometry.webloc

4.) watch this video to get pumped!:

file:///Users/Emma/Desktop/YouTube%20-%20Mathmaticious.webloc

Happy Studying!!!! :)

Emma

Final exam guide (Unit three)

Chapter 6 (Circles)

This same video site, has even more than just this one. But this one does the best job with circles.
Calculating the Perimeter of a Circle: Geometry Tips | eHow.com

Web sites
A good web site, covers stuff we learned in class. The very bottom has a few this we don't need to know.
http://www.coolmath.com/reference/circles-geometry.html#The_radius_of_a_circle


Chapter 7 (Similar Geometric Figures)
Similar Figures

Good video



Web sites

http://www.mathsisfun.com/geometry/similar.html

http://money.howstuffworks.com/personal-finance/math-tutoring/geometry/similar-figures.htm

Congruent figures



Web sites

http://www.mathsisfun.com/geometry/similar.html

http://www.beaconlearningcenter.com/WebLessons/CongruentConcentration/default.htm#page7

http://www.ies.co.jp/math/java/geo/congruent.html

FINAL EXAM study guide. unit 4 (in progress)

Chapter 8. Volume

Pythagorean Theorem

http://library.thinkquest.org/20991/geo/stri.html

Special Right Triangles

http://www.cliffsnotes.com/WileyCDA/CliffsReviewTopic/Special-Right-Triangles.topicArticleId-18851,articleId-18821.html

http://www.onlinemathlearning.com/special-right-triangles.html


Chapter 9. Volume

Volume Formulas and Explanations

http://math.com/tables/geometry/volumes.htm

Prisms and explanations

http://library.thinkquest.org/20991/geo/solids.html

Prep guide for final (Unit one)

Chapter One (Length)

*If you want to make up conversion problems and make sure you got the correct answer this website will help*

This is a link to a video on converting from the metric system to the British system. The first example will diffidently show up on the final.


Chapter Two (Angles and Their Measures)

This is a great web page.
http://www.mathleague.com/help/geometry/angles.htm

This video is a little long, but if you are totally in the dark about classifying angles these examples will be helpful.



Chapter Three (Angles Formed by Intersecting Lines)

Nice review video
http://www.youtube.com/watch?v=Pa9OewcfORw

Good website!!
http://www.mathwarehouse.com/geometry/triangles/index.php

Scribe Post, December 4th, Jordan

So today we continued going over Chapter 9, Which is the Volume chapter. We started off with daily quiz #33. which was about the volume of a sphere. Once we were finished with that we went over daily quiz #32. daily quiz #32 was, if you have a sphere with a radius or 6 in a box and its touching all sides what is the volume of the space not taken up by the sphere. So to start this problem you have to find the volume of the box and the volume of the sphere. Drawing a picture first usually helps.

volume of a sphere: Volume of a cube:

V=4/3(pi)r^3. V=b*w*l

V= 4/3(pi)216 V=12*12*12 (radius is 6 & the diameter is 2(r) & 2*6=12 &the diameter=l,b&w)

V=288(pi) V= 1728

V=904.78

Volume of the cube-Volume of the sphere=left over volume

1728 - 904.78 = 823.22 units^3

Then we went over the answers for the homework that our classmates did and check to see if they were correct or if we had messed up in making the problems. After that we talked breifly about Tuesdays test and then were dismissed.

next scribe is Christian.

Scribe Post, December 3, 2009, Noah

Hello Everyone!

Due to my internet being down for the past two days, My scribe post is now being posted.

Today in class we had a very productive day! We are continuing with Chapter 9 and Volume. Remember Chapter 9 Test will be next week, December 8, 2009. It will be our last test before the final. Our final for the class will be cumulative. What is really great is that Jojo told us that everything we have learned, gone over this term, and written on the blog is still online. Having all this material still on the blog, can make it very beneficial when creating a study guide for the final.

Today in class we took Daily Quiz # 32.

"A sphere with a radius equal to 6 in is enclosed in a box. The ball touches all six sides. Find the volume that is unfilled in the box."

Hopefully the next scribe can post the answer to the Daily Quiz 32, in the next post.

We also went over in class Daily Quiz # 31. Anna Daniel did a great job yesterday explaining the answer, which was very useful. Something to remember about the Daily Quizzes for this upcoming week is that they will cover old material. For Example. Daily Quiz #32. was a problem about conversions. We went over conversions in Unit one.

Daily Quiz # 31.

70m/ 1h. ----> ft./1 sec.

Here is the ANSWER to the Daily Quiz #31.

( i know that is written in a weird way, if someone knows how to form real fractions on this blogger, please let me know, and i can fix this. thanks.)

ANSWER:

70m/1 (x) 5,280 ft./1 mi. = 369,600 ft./1 hr.(x) 1 hr./60min. = 369, 600 ft. /60 min = 6160 ft./1 min. (x) 1 min/60 sec. = 6160 ft. /60 sec. = 102.67 ft/sec.

After we went over the Daily Quiz, we all got our Chapter 9 problem homework out and turned it in. Then we were asked to answer someone else question, which was very helpful! It was a great way to challenge ourselves for the test on Tuesday, December 8th.

I hope everyone is feeling confident for the final coming up.

have a wonderful weekend and don't forget to study for the Chapter 9 Test.

Have a great Day,

Noah

The next scribe is Jordan.

Sphere video

http://www.youtube.com/watch?v=FmngB6YnqP4

This link provides a video demonstration of how to calculate the surface area and volume of a sphere. I hope it is helpful.

Cone diagram

I hope this diagram helps with determining the volume of a cone. Enjoy.

Scribe Post-Camila-Chapter 9-12/01/09

Scribe Post 12/1/09

Although JoJo was not in class today we had a chance to review our volume worksheets and homework problems. I will list a few formulas that should help you work these to assignments out and help review for the test and the final. Happy Studying and Happy December!

Almost Done!

-Camila

next scribe is Andrew (sorry budz) :)

The Volume of a Stubby:

Vs=1/3(Ab)(Hs)

Volume of Pointy:

Vs=1/3(Ab)(Hp)

Volume of Sphere

Vsp=4/3(pi)(r^3)

Volume of Hemisphere

Vh=2/3(pi)(r^3)

scribe post---chapter9---11/18/09---kharon

Today in class we took a daily quiz reviewing stubbies. After the daily quiz we expanded on the volume equations we will be using to solve the volume problems. Today we learned about POINTIES, which are similar to stubbies but also different. Stubbys have two similar bases and pointies only have one base and one point(hint the name POINTIE). An example of a pointie is a pyramid. The equation to find out the volume of a pointie is as follows Vp=Ab*Hp, which in words is Volume of Pointie=Area of Base*Height of Pointie. We went over one example problem, then we watched jojo play with his Pointie Toys. Then we did our homework which was all about pointies and finding the volume of them. We watched a movie about pointies that explained them and showed examples. The guy in the video had a pretty cool accent But yeh...POINTIES!

the next scribe is....uhh....hmmm....Jericho!

Chapter 9, Monday Nov. 23, Scribe post, Jericho

Hey guys

So today was a pretty chill day in class. We started the day off by taking a daily quiz, then once

Jojo collected the DQ and the note cards, he passed out the answer manual and allowed us

to check our answers for a few minutes. Then we all said which ones we had questions on and Jojo went over them on the board. We did #9, 14, and 1f. 

This chapter about volume and solving for missing sides or the volume of a certain figures really is not that difficult in and of it self. There are just a lot of steps that you have to go through to solve the problems. So I would say take your time on each one, and work on memorizing the different types of shapes and the equations for finding the area of them. 

The sheet that Noah posted (Volume of Shapes) is very helpful, so I would look at that.

Have a good rest of your short week! and a happy thanksgiving!

LOOK! HELPFUL FOR DAILY QUIZ STUDYING AND FINAL!

Hope this is helpful! :)

Scribe Post, Chapter 9, Charles 11/17/09

Sooooo because Jojo has been struck with the bubonic plague for the past few days. Our schedules have been a lil bit off-ish between the 3 classes. Ya figgadeal me? So for some of you this may be a review of the day and for others you should consider reading this post as "getting ahead". It'll almost be as if you know what Jojo will say before he says it. In 3rd period today (SHOUT TO MY ClASSMATES) we started working on Chapter 9 which revolves around finding the Volume of 3-Dimensional geometric figures. As Jojo began his lecture today on Chapter 9 he introduced us to a "term" that helps describe a certain type of 3D geometric figure. This term is known as a...Dunh...Dunh ....DUUUUUNH.... "STUBBY" (or stubbies/stubbys for plural). This term is the first cousin once removed of the infamous "Animal" you've probably heard Jojo say a couple of times in class. Well a stubby is described as, " A 3D geometric figure that has the same shape for the base as it has for the top."

This cylinder for example would be classified as a stubby because it's bases are the same shape.

But this cone cannot be classified as a stubby because even though it is a 3D geometric figure it does not have two bases that are the same shape.

In order to find the volume of the stubby you must use the formula V=AH when V=volume, A=Area and H=Height.
After all of these rules about the stubby were written down Coco Jadray caught wind of another headache due to his chronic bubonic plague therefore we sadly could not continue our lesson and we began to use what learned from the reading we did the night before and lesson we learned about our new friend the stubby and began to do our homework. This consisted of knowing all the formulas to find the volume of the geometric figures we will be studying in class. Soooooo I took the liberty of finding some brief videos that will help give us the basic idea of how to use the formulas and find the volume of the different geometric figures given on present and future homework, DQs, and tests.

http://www.youtube.com/watch?v=g6EbYO7FQDI&feature=channel
http://www.youtube.com/watch?v=8is_l6gtN40&feature=channel
http://www.youtube.com/watch?v=FyznprKzLN4&feature=channel
http://www.youtube.com/watch?v=ZDK9O28mDCo
http://www.youtube.com/watch?v=-YaLh-uMImw


Next Scribe is ...TADAAAA...K-Ron. YAAAAAY!!!! GO K-ron!!!!

Tom, Scribe Post, Chapter 8, 11/12/09

MATH CLASS (YAAYYYYYYY)

Today was a great day in math.

We started the class off with a daily quiz where you needed to determine what type of right triangle a certain triangle was or weather it was a right triangle at all.

But to figure out the answer to this question i guess you will just have to go to class tommorow and find out.

As every one should know we have a Test on Tuesday. So we discused the test and the tutorial design sheet which will be finished tommorow and should be posted by saturday.

Jojo than passed back daily quiz #27 the question for this daily quiz was basicaly the same as todays just determining a different triangle. We first can see that the triangle is a right triangle because there is a half square as an angle indicating the right triangle. The other side lengths are leg1=3 and the hypotenuse=6 The two special right triangles we know are 45/45/90 and 30/60/90 so i found it right to look for these two first and if it is nether than we know the answer will be a different right triangle. I found the best way to determine the different triangle it could be is to find the length of the missing side. After inserting the numbers into pathagorians theorm A^2+B^2=C^2 we come out with 3^2+x^2=6^2 where x is the missing leg. We than get 9+x^2=36 subtracting 9 from each side we get x^2=27 we than need to get the square root of each side coming out with x=5.2

Than comes finding out what kind of triangle we have. we know in a 45/45/90 the two legs will equal eachother and we can obviously see 3 does not equal 5.2

In a 30/60/90 triangle leg1=1 leg2=square root of 3 and the hypotenuse=2

if we multiply the leg(3) by the square root of three we get 5.2 which lets us know the triangle is a 30/60/90

Ok well i know that if i put a vidieo up no one would watch it but what if i told you it was a little british boy singing than you cant not watch it. it is truly nessesary.

http://www.youtube.com/watch?v=bP3i5dpezuk&feature=related

Just watch it. It will actually raise your test score by at least 10 points probably more.

well thats a wrap i got nothin more to tell you about math.

accept that the next scriber is gunna be charles...sorry dude dont hate me....

Henry, Scribe Post, Chapter 8

Today in class we talked about the homework assignment which was assigned on the 9th (monday). The assignment was on page 108 and included all of questions 8 through 15.

In order to create a scribe post for today's class I will review some of the things which we used to solve these problems. For more specific answers, I suggest you consult a classmate of PB Works on the assignment.

To complete problems 8 and 9, you must have known the rules of special right triangles like a 30-60-90 right triangle and a 45-90 (or 45-45-90) triangle. In an attempt to avoid redundancy, I would suggest you refer to Andrew's post on special right triangles from yesterday which covered all the things you need to know.

The pattern I observed throughout the problems on this assignment was the need to create triangles in order to solve for other lengths.

In 10, you needed to create a right triangle to solve for the height of the triangle.

In 11, you needed to use the information given in the hint and apply that to the understanding you have of relative lengths of a triangle.

In 12, you needed to use your knowledge of pythagorean's theorem to solve for the variables.

In 13 and 14, you needed to use the grid provided to create right triangles off of the hypotenuses who's lengths were not given in order to solve for said hypotenuse.

In 15, you needed to solve the length of a hypotenuse which acted as the diameter of a circle at which point you needed to solve for the area using the formulas we learned in the previous chapter for area of a circle

Be sure to check back in your book to the reading assignment sections which you didn't understand. All of the processes required to solve problems assigned in the homework are provided earlier in your textbook.

Remember that our test on chapter 8 will be on Monday. Prepare for it with the information given on our various resources.

The next scribe will be Tom.

Andrew, Scribe Post, Chapter 8

In class we have started learning about the Pathagorian Theorm (A)^2+(B)^2=(C)^2 or (Leg1)^2+(Leg2)^2=(Hypotenuse)^2

We also began talking about Right Triangles and in class we learned some special right triangles.  We learened the 30-60-90 triangle and the 45-45-90 triangle.  These two triangles have side lengths whose ratios will always stay the same and make it easy for us to solve for missing side lengths.

                                                                               30-60-90 triangle

                                                                     45-45-90 triangle
Using these special triangles we can take the proportions of the sides to find the side lengths of similar figures and we can use the proportions to find missing side lengths.
This is a very useful tool and all you have to remember is:

30-60-90 triangles 

leg=1

leg=square root of 3

hypotenuse=2

45-45-90 triangles

leg=1

leg=1

hypotenuse=sqaure root of 2

We will have a test on November 16 on Chapter 8

The next scribe is Henry

Monboss, Scribe Post, Chapter 8

Howdy Guys,

Today we began a new chapter; Chapter 8: The Pythagorean Theorem and Special Right Triangles. We started class by exploring and looking into what exactly is the Pythagorean Theorem. The Pythagorean Theorem was developed by the philosopher and mathematician Pythagoras.




What is the Pythagorean Theorem?
Pythagoras proved that every right triangle square is
a^2 + b^2 = c^2
or
(leg)^2 + (leg)^2 = (hypotenuse)^2

Here's an example to show the equations use:




The figure above shows us the use of the equations because the number of squares around one side or leg of the triangle added with another side or leg of the triangle equals the hypotenuse, which is the sum of the two legs.

Example of the use of the Pythagorean Theorem:
(a)^2 + (b)^2 = (c)^2
(2)^2 + (3)^2 =(c)^2
4 + 9 = c^2
(squar. root)13 = (squar. root) c^2
c = (squar. root) 13

The Importance of Perfect Squares in the Pythagorean Theorem
It is important to know your perfect square, numbers that you will get if you multiple two numbers that are the same together ( e.g. 2*2, 3*3, etc.), because a lot of times you will need to simplify a number under the radical.

For example:
(2)^2 + (4)^2 = c^2
4 + 16 = c^2
20 = c^2
(squar. root)20 = (squar. root)c^2
now this is where some people will stop and believe the problem is over; however, using perfect squares we can simplify (squar. root)20 to:
(squar. root)4 (squar. root)5 = c
using my knowledge of squares, i know that the square root of 4 is 2 giving me:
c = 2 (squar. root)5

Now you are probably wondering how did i figure out that 4 and 5 will allow me to simplify (squar. root)20. Well this where the importance of knowing your Perfect Squares is vital.
Here are the Perfect Squares till 15:

4
9
16
25
36
49
64
81
100
121
144
196
225

Well young lads and young ladies that is all is I have for you.
May knowledge and strength be upon you.
Next Scribe Andrew

- Monboss

Scribe Post, Noah, Chapter 7

Hello Everyone, i hope everyone is well-rested from their exciting halloween weekend.

Today in class we had our Daily Quiz 23. On the quiz, it gave you two triangles with one missing side. You

had to find the missing measures. Be sure you know this for the test. The quiz went great, it was more difficult from the previous quizzes, so if you need extra help on that quiz, be sure to talk to a study group or a teacher before the test on Thursday, November, 5, 2009. We also got our quizzes back from Daily Quiz 22. Which a lot of people did greatly on. Today we also got the opportunity to look over our homework and check with the handy dandy answer packets. Many students had questions on Question 8,

Focusing on Question Eight, we made sure to cover the different ways you could answer the problem.

The Image above, shows a collection of congruent shapes

We went over how you can use a proportion to find the answer to the problems.

With the great help of our teacher, we were able to look at some example problems and go over the questions that many students had in class. Because we got so invested in figuring out and answering the many questions students had, class was cut short and we weren't able to finish all the problems.

Even though today was a more low key day in class, it was still important to stay focus and take good notes,

.

Just a couple of helpful reminders :

1. Be sure to take extra detailed notes on your homework and in your math dictionary these last couple of days before the test, so you can be prepared for it this upcoming thursday.

2. Be sure to come to class with questions to be addressed.

3. If needed be sure to get a study group together sometime this week, if needed

4. Make a study guide for the test on thursday, it can be great fun and very useful

5. Review your notes every-night before bed, it can help a lot

The Next Scribe will be posted by Jojo, there are no more scribes available at the moment

Have a great evening, and get a good nights rest, and be sure to come to class prepared for a great day!

The PoP Reflections BoB

This post will act as both a PoP and a BoB. So, it is basically "required" extra credit!

In this reflection post, I would like you to comment as you generally would, but all comments are due tomorrow!

Please share all of the homework problems which you have the correct answer from the manual, but were not explained in class to you by the teacher or by a fellow student and you must review before the test. We will look to get them all covered in the next day or two. Please include your class period so I can organize the questions.

In addition to those questions, please make general BoB comments (that's where you get the extra credit)!!!

I am going to offer you one bonus point on your test with completion of a simple assignment. I would like you to post your reflections on the material covered so far. Just comment on this post. To get that bonus on your test, the kind of post I'd like you to make should have one or more of these characteristics:

• A reflection on a particular class (like the first paragraph above-how did that class enhance your learning?).
• A reflective comment on your progress in the course.
• A comment on something that you've learned that you thought was "cool".
• A comment about something that you found very hard to understand but now you get it! Describe what sparked that "moment of clarity" and what it felt like.
• Have you come across something we discussed in class out there in the "real world" or another class? Describe the connection you made.

Anna D - Scribe Post, Oct. 30

Hey guys. :)
On Friday, we didn't have a DQ. The class was divided into groups based on which problems on the homework we didn't understand. This method has worked pretty well so far (at least for 3rd period). In our groups, we discussed our methods of approach regarding the problems we didn't get right or just didn't get at all. Some parts of the homework were pretty tough, but we got through them fairly well.

Our homework focused on similar figures and finding proportions with which to solve them. Similiar figures are geometric polygons that are the same shape, but aren't necessarily the same size. For example...


These two trapezoids are the same shape, but their sides aren't of equal measure.

There are several different ways triangles can be similar.
1) They are not the same size, but they do contain equal angle measurements.
2) A smaller triangle is made from an angle of the original triangle.
3) Their sides can be proportioned (this really goes for any similar figures).

#1:
The triangles aren't the same size, but they are the same shape and have the same angle measurements of the corresponding angles on the other triangles.

#2:

The section at the top of the triangle is similar to the full triangle.

#3: (This is pretty tiny and a little confusing, but I think you guys get the point already.)


That's similar figures for ya :) The next scribe is Noah.

Happy Halloween yall.

Scribe Post-Noemi-Chapter 7

Hey Chikos and Chikas!

Today we took Daily Quiz #23. It asked to draw a pair of similar figures and define what made them similar. If you read the night before you should recall that two figures are similar if (1)they are exactly the same shape or (2)if one of the figures can be rotated,translated, or reflected to coincide with the other figure. Knowing that hopefully everyone got a 5/5 on their quiz.

We also got our Daily Quiz #21(Area of a Circle) back and went over it in class.
C=7π/2 (We are given this) C=2πr (We know this) A=πr^2
First, you have to figure out the radius(r). Which turns out to be 7/4 feet. Knowing (r), plug
it in to the area equation to solve for the exact area. This turns out to be 49/16π feet squared.
It also asked to solve for the approximate value using π. The answer turns out to be 9.g feet
squared. Finally, it asked to find the area of a rectangle around the circle. Knowing that the diameter of the circle equals the length of the sides of the rectangle we can figure out the area if the rectangle. D=2r and r=7/4 feet so the radius diameter equals 7/2 feet. Know you can figure
out the area of the rectangle. A=bh which equals 49/4 feet squared.

We went over Chapter 7 but more specifically we went over Congruent Triangles. Triangles are
congruent when all corresponding sides and interior angles are congruent. The triangles
will have the same shape and size, but one may be a mirror image of the other.

To denotate congruent triangles with hashes or arcs you must have the same number on the
corresponding sides to show that they are congruent.







▲ABC≅▲DEF

• Congruency does not depend on orientation
• Congruent figures should be able to be rotated,translated, or reflected so all vertices sit atop each other when the shapes are placed on each other.
• The symbol to show two figures are congruent you use ≅
• The symbol to show that two figures are similar you use ~

The last thing we did was watch a video on YouTube about Similar Figures. Here's the link: http://www.youtube.com/watch?v=9IUI3jtSEWU

Don't forget to do the homework, Adios. (Next Scribe is Anna!)

Katherine Scribe Post Monday October 26

Hey Guys!

Yesterday during class we started with JoJo checking our homework. He said that we are better off to do our homework even if we know it's wrong, because if he just checks it you will get a hundred, and your work is worth much more than the right answers. Also, he said that you can always get late credit for work that wasn't finished on time, so even if you can't manage to finish it on time, make sure to finish it by the next day.

Don't try and guess when JoJo is going to check, just do the homework.

When doing your homework it always helps to draw a picture, it makes things clearer as to what you are missing.

We would all benefit from forming study groups that meet regularly. The input of all the people together is usually going to have the correct result for a question.

Yesterday we were trying to discover the benefits and value of a study group. We all got into groups that JoJo assigned us, and worked on one problem from the homework. We will stay in the same groups for tomorrows class and take 15 minutes to present our question to the class, so that we all come to a great understanding of all of the problems.

=)

Good luck with your presentations!

The next scribe is Luke.

Jordan Scribe Post

Hey Yall sorry this is a bit late. but, on friday we took Daily Quiz 21 and went over DQ #21. And jojo handed back other DQs. We got together in groups and went over the questions that we wrote from thursday nights homework about Subtended Angels. there are two differant types of subtended angels. 

Central Angels. and Circular Arcs. 

an angle subtended by a circular arc at the center of the circle is called a central angle. and an Arc that is part of a circle is called a circular arc.

If you Check out page 77. There is a complete explanation of subtended angels, diagrams and all.

next scribe is Katherine. 

Scribe Post-Camille-Thursday Oct 22

Hey fellow mathematicians,

So we had a pretty light class today, but we kicked if off with a rap from Tom. Complete with beats and everything.

We moved on to covering the formula for AREA OF A CIRCLE!

In case you have forgotten it and did not write it down I have it riiight here:

A=⫪r²

If you need further explanation I have this handy little link here that might just help you:

http://www.worsleyschool.net/science/files/circle/area.html

Sweet, then for the rest of the class we went over yesterday's homework and everyone got caught up there.

Don't forget that we have the flickr assignment due tomorrow! I'll look forward to seeing all the pictures.

Next Scribe is Jordan!

Later,

Camille

Scribe Post - Madison - Ch 6

Today in class we started by taking Daily Quiz #19 which involved using the equations for circumference and diameter. Shakespeare put those on his scribe post yesterday for anyone who needs a refresher.

We then went over some problems in class from the homework problems from 2 nights ago. One of them, 2c looked like this:

• A circle has a circumference of exactly 7pi/2 feet. What is the exact length of the diameter?
• Start by stating what you know, C(circumference) = 7pi/2 and the formula for diameter D=c/pi
• We now have a systems of equations. So plug in! D= 7pi/2|pi/1 (7pi/2 is over pi/1 making it a fraction)
• Because we have two fractions on top of each other, we multiply by the reciprocal of the bottom fraction, 7pi/2 x 1/pi This causes the two pi symbols to cancel out, creating D= 7/2 which equals 3.5. So the exact length of the diameter of the circle is 3.5 feet.
  

I'm sorry if that looks a little confusing. All the 'pi' are the pi symbol and all the / and | marks are fraction bars!

We then went over how to find the area of a circle.

The formula to find area is (where r is the radius of the circle.)


The area here is given in terms of the radius, but because we know that D=2r, IF it is given in terms of the DIAMETER, we'll know how to do it!

Jojo told us that area has to do with space that is measured in square units and circumference has to do with length and distance.


Some helpful links that can explain further about finding the area of a circle. A little dry, but hey, they work.
http://www.mathgoodies.com/lessons/vol2/circle_area.html

http://www.youtube.com/watch?v=eBAsK9jB91I (She's a little....robot-y but it really explains what we went over!!)

http://www.youtube.com/watch?v=Q081LTbFtMo&feature=PlayList&p=0A3DF1D5B4A25D75&playnext=1&playnext_from=PL&index=4 (this one you can pause on the steps)

Everyone remember to post their circle picture on Flickr!!!! Remember that it can take a couple of days to show up....!

Next scribe is Camille