Question

If angleA and angleB are supplementary angles, and angleA = 63°, find the measure of angleB. A. B = 27° B. B = 63° C. B = 117° D. B = 153°

Answer 1

C. B = 117° because 63°+117°=180°

Answer 2

Answer: C.   B=117°.

Step-by-step explanation:

We know that if a pair of angle are supplementary then their sum is added up to 180 degrees.

Given : angle A and angle B are supplementary angles.

i.e $\angle{A}+\angle{B}=180^{\circ}$

Also, angle A = 63°

i.e  $63^{\circ}+\angle{B}=180^{\circ}$

i.e  $\angle{B}=180^{\circ}-63^{\circ}$

i.e  $\angl{B}=117^{\circ}$

Hence, the measure of angleB is 117°.