Question

Angle R and S are supplementary. If Angle R measures 115o what is the measure of Angle S?

Answer 1

supplementary angle is equal to 180

r+s=180

115+s=180

s=180-115

s=65

Answer 2

If the sum of two angles are 180 degree, they are called supplementary angles.
Angle R + Angle S= 180 degree
115•+ Angle S = 180 degree
Angle S = 180-115= 75 degree