Question

Angle c and angle d are supplementary, the measure of angle d is eight times the measure of angle

c. find measure of angle c and measure of angle d

Answer 1

160

Explanation:

Answer 2

Two angles are supplementary when they add up to 180 degrees ⇒
d = 180 - c
and
d = 8c (given)

8c = 180 - с
8с + с = 180
9с = 180
с = 180/9
m∠с = 20°
m∠d = 8c = 8*20 = 160°