GTA3 (2010): Review

Tuesday, May 4, 2010

$\frac{a}{\sin A} = \frac{b}{\sin B} = \frac{c}{\sin C} = 2R,$

$c^2=a^2+b^2-2ab\cos C ,\,$

Area of a triangle

$Area = \frac{1}{2}ab\sin \gamma = \frac{1}{2}bc\sin \alpha = \frac{1}{2}ca\sin \beta$

Area of a triangle using Heron's formula

(we did not learn this one in class but i thought it might be useful)

You can use herons formula if you are given all sides and no angles

$Area = \sqrt{s(s-a)(s-b)(s-c)}$

where $s= \frac{a+b+c}{2}$

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GTA3 (2010)