Question

if one triangle measures 60° prove that it is an equilateral​

Answer 1

Your answer-

Accordingly, all the 3 sides of the equilateral triangle hold equal angles. Since, we know, that the sum of all angles of any triangle be 180° . Let each angle be a. ... Hence, we can show that all the 3 angles of an equilateral triangle hold equal angles; i.e. 60°