In the figure below, given that , , and , find .
Step 1: Find .
If two sides of a triangle are congruent, then the two angles
opposite to those sides are also congruent. In ,
since , then .
Write an equation to show that the sum of angles for
is . Let represent
and , and solve for the value of .
Step 2: Find and .
To find , subtract from
Step 3: Find .
Subtract 's two other angle measures from