Question

7. If angle A is supplementary to angle B, angle A

and angle C are vertical angles, and the measure of angle C =
45, what is measure of angle B?

Answer 1

angle b is 135 degrees

Explanation:

lets work backwards to solve this

if angle c is 45, c is vertical to angle a, and we know vertical angles equal each other, we can reduce that angle a equals 45

if angle a is supplementary to angle b, and we know angle a is 45 degrees, we can make the equation 45+b=180. subtracting 45 from 180, we get 135 degrees for angle B