What is the measure of an angle that is eight times its supplement?

Remark

Supplementary angles = 180°

Givens

Let the supplement = x

Let the original angle = 8x

Formula

x + 8x = 180°

Solve

9x = 180° Divide by 9

x = 180/9

x = 20

Answer

The original angle = 8*20 = 160°

The Supplement = 20°