Scribe Post-Tom-ch.4 and ch. 5 Polygons

Polygons September 21

Today we started class by going over the reading in last nights homework. We decided the best thing to do would be to do the reading before jumping straight into the problems seeing that the reading explains how to do most of the problems for you. We went through the reading looking at it in a way of if we were just skimming through this what would draw us in to look at in more detail. We decided that what drew us in were the images, bold words underlined words and anything that was covered by bold brackets. Going through the reading looking at only these key areas one could get the information you needed without having to spend large amounts of time reading every word. You could see examples with the images, and learn the vocabulary by looking at all the bold words.

After going through the reading we looked at this website

http://www.vias.org/comp_geometry/geom_triangle_altitude.html

This page helped us understand altitudes or heights of a triangle. We learned that with

a triangle there are three potential heights and three potential bases but once you decide on one, there is only one.

for further help on Altitudes of triangles you can watch this video.

http://www.youtube.com/watch?v=rZkTH2UMK8Q

We went over problem #1 in the homework from last night (p. 53)

this was a two part problem

A) "give all six names of the triangle shown at the right"

(this is not the exact image from the homework but for the concept of this problem it still works.)

The homework says to name all possible sides

the possible sides are

ABC

BCA

CAB

ACB

CBA

BAC

How you find this is start at any one point and from that point you count ether clockwise or counter clockwise until you reach the point you started at. Than you go the opposite way you went the first time. you do this starting from each point until you have gotten a name for each point going clockwise and counter clockwise. A way to find if you have the correct number of names is you know how many names a polygon should have by taking the number of vertices you have and multiplying that by 2 that is the number of names you should have.

The second part of this problem was the same concept of determining sides but instead of a triangle it was an irregular hexagon.

B) "A hexagon is shown at the right. using the vertices this hexagon has twelve names. two of these names begin with X. what are these two names?"

you go about this part the same way you would for part A. However instead of finding a name going both counter clockwise and clockwise for every point you would only do it from the point labeled X in this case.

coming out with the answer.

XDRYFP and XPFYRD

This sums up math class for monday september 21 we spent most of the time going over study skills for reading assignments then went over some new concepts and worked some homework. All and all it was a good day.

Tomorrow we need to turn in out drawing of a country, county or state drawn as polygons so everyone make sure you get that done.

For tomorrows scribe I am going to pick Andrew