Question

What is the measure of ZB?

Answer 1

Explanation:

Answer 2

m<B=60°

Explanation:

an exterior angles equals the sum of its two remote interior angles, so:

m<A+m<B=m<BCG:

3x+4x=10x-45

7x=10x-45

-3x=-45

x=15

to find the measure of <B:

since m<B=4x:

4(15)=60°

so, m<B=60°