If you know that two angles are supplementary angles and you know the measurement of one of the angles, describe how you would find the measurement of the unknown angle.

Answer 1

Supplementary angles add to 180 degrees, by definition. To find the unknown angle, subtract the known angle from 180 degrees.

For example, given an angle A of 65 degrees, its supplementary angle would be:

= 180-A

= 180 - 65

= 115 degrees.

Answer 2

By DEFINITION, supplementary angles add up to 180.

For GIVEN ANGLE T, the unknown supplement is simply 180 - T

For example, suppose the given angle is T=30.

Then the unknown supplement is 180- 30 = 150