Find the reference angle of the angle 9 pi7 The reference an

Find the reference angle of the angle. 9 pi/7 The reference angle for 9 pi/7 is 2 pi/7. (Type your answer in radians. Type an exact answer, using pi as needed. Use integers or fractions for any numbers in the expression.)

Solution

The rule for finding the reference angle is-

1st quadrant---- theta

2nd quadrant --180(pi) - theta

3rd quadrant---- theta- 180(pi)

4th quadrant ----360 - theta the angel 9 pi /7 is in 3rd quadrant so reference angle = 9pi/7 - pi = 2pi/7