Two angles A and B are supplementary. Angle A measures twice as much as angle B. Find the measures of the two angles.

Question

Please help me, I already know the formula on this problem but can't figure out the equation to use.

Answer 1

Supplementary angles add up to 180 degrees, we have to use this fact and the given information to solve the problem:

A + B = 180

A = 2B

2B + B = 180

3B = 180

B = 60

A = 2B = 2(60) = 120

Angle A is 120 degrees and B is 60 degrees.