Question

The measure of an angle is 139.2°. What is the measure of its supplementary angle?

Answer 1

40.8°

Explanation:

The sum of two supplementary angles is 180°.

180 - 139.2 = 40.8

The measure of it's supplement should be 40.8°.

Hope this helps.

Answer 2

Supplementary angles mean two angles that add up to 180.

180 = 139.2 (angle 1) + x (angle 2)

180 - 139.2 = x (angle 2)

40.8 = x

angle 2 = 40.8