The ratio of the measures of two supplementary angles is 7:3. Find the measures of the angles.

A. 126° and 54°

B. 72° and 18°

C. 159° and 21°

D. 69° and 21°

Supplementary angles are angles in which the total is equal to 180 degrees when summed. when the ratio of the angles is 7:3 we let x be angle 1 hence,

7x + 3x = 180

simplifying,

10 x = 180

x = 18

Hence angle 1 is 126 degrees and angle 2 is 54 degrees. Answer is A.