Question

Find the measure of the supplement of an angle of 135°.

Answer 1

Let the supplementary angle measure p°.
The sum of the measures of two supplementary angles is 180°.
135 + p = 180
∴ 135 + p - 135 = 180 - 135
∴ p = 45
∴ The measure of the supplement of an angle of 135° is 45°.