Question

If ∠A and ∠B are supplementary angles and ∠A is 78°, what is the measure of ∠B?

Answer 1

102 Degrees

Angle A and Angle B are supplementary to each other.

Angle A measure = 78 degrees

Find Angle B

We know that in a supplementary relationship between two angles, the sum of both of the angles are equal to 180 degrees.

Here we know that Angle A = 78 degrees

Angle B = 180 - Angle A = 180 - 78 = 102 degrees.