In the figure below, given that , ,
and , determine .
Step 1: Determine .
All 3 sides of are the same length, so it is an
equilateral triangle and each angle's measure is .
Step 2: Determine .
has 2 sides that are the same length, so it is an
isosceles triangle with base angles that are equal in measure.
Write an equation to show that the sum of 's angle
measures is . Let represent the measure of each
base angle , and solve
for the value of .
Step 3: Determine .