Question

In the adjoining figure, ∠a = (120 - x)^o and ∠b = 5x^o, the measures of ∠a and ∠b.

• A. 125^o, 55^o
• B. 52^o, 65^o
• C. 75^o, 75^o
• D. 100^o ,100^o

Answer 1

The correct option is D

100^o ,100^o

The corresponding angles are equal

(120 - x)^o = 5x^o
6x = 120^o

x = 20^o

a = 120^o- 20^o= 100^o, b = 5 x 20^o = 100^o