Question

Determining the Sides of a Given Triangle

Problem: Construct a triangle with interior angle measures of 60° and 60°. Let one of the side lengths be 10. What are the lengths of the other sides?

Answer 1

The angles sum to 180°, so the third angle is 180° − 60° − 60° = 60°. Thus the triangle is equiangular (all angles 60°) and hence equilateral. All sides are equal, so the other two sides are also 10.