Angles A and B are supplementary. If m ∠ A = 45°, find m ∠ B .

A. 45°

B. 145°

C. 135°

D. 15°

Question

Jakobe Yang

20 October, 12:45

+2

Answers (2)

Know the Answer?

Abagail Moran · Answer 1

Supplementary means they add to 180

a+b=180

a=45

45+b=180

minus 45 both sides

b=135

answer is C

Rodney Robbins · Answer 2

If Angles are supplementary, means they both add up to 180 degrees.

A + B = 180°

45 + B = 180°

B = 180° - 45°

B = 135°

Option C.

Angles A and B are supplementary. If m ∠ A = 45°, find m ∠ B .A. 45°B. 145°C. 135°D. 15°