Question

write the measure of exterior angle of an equilateral triangle

Answer 1

each exterior angle of equilateral triangle=180°-60°=120°

Answer 2

The equilateral triangle means all the sides of the triangle are the same length.

Therefore, the interior angles are usually equal.

This means each interior angle must be 180/3 = 60degree.

Likewise, the measure of the exterior angle equals to 360degree when the number of sides divides it.

Therefore, the exterior angle will be 360degree/3 = 120degree.

If you add both interior and exterior, you will get 180.