How do we find the measure of an angle

The other common measurement for angles is radians. For this measurement, consider the unit circle (a circle of radius 1) whose center is the vertex of the angle in question. Then the angle cuts off an arc of the circle, and the length of that arc is the radian measure of the angle.

Depending on what you are given you can find it several ways

8. a. 7

   b. 7(2x+4y+3)

9. 3(5a-2b+12)

  -3(-5a+2b-12)