Raymond B. answered • 05/01/21
Tutor
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Math, microeconomics or criminal justice
9pi/7 is coterminal with -33pi/7
it's rotated 180 degrees (or pi radians) from 2pi/7
-33pi/7 = -35pi/7 + 2pi/7= -5pi + 2pi/7
2pi/7 + pi = 2pi/7 + 7pi/7 = 9pi/7 = the positive angle between 0 and 2pi that's coterminal with -33pi/7
-33pi/7 + 5pi = 2pi/7 5pi rotates the angle 180 degrees (5pi-4pi=pi)
5pi= 35pi/7
-33pi/7 +35pi/7 = 2pi/7 rotate 2pi/7 by pi gives 2pi/7+pi = 2pi/7+7pi/7 = 9pi/7
