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?

angle b is 135 degrees

Step-by-step 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

1+1=2

it's 2

Step-by-step explanation: