Question

A side of the triangle below has been extended to form an exterior angle of 72°. Find the value of xx

Answer 1

x + 20 = 72

x + 20 - 20 = 72 - 20

x = 52

Answer 2

x=52

Explanation:

The exterior angle of the triangle is equal to the sum of the opposite interior angles

72 = 20+x

72-20 = 20+x-20

52 =x