Find and .
Step 1: Find .
Since , is an isosceles triangle. In any isosceles triangle, the angles opposite to the congruent sides are congruent.
Write an equation to represent the sum of angle measures in . Let represent and , and solve for .
So, and are each .
Step 2: Find .
is an equilateral triangle, so all its angle measures are equal. To find the measure of any angle in the triangle, divide the sum of a triangle's angle measures by 3.
To find , subtract from .