Subtract from .

The resulting angle of is positive, less than , and coterminal with .

Since is in the first quadrant, the reference angle is .

Find the Reference Angle 2.5pi

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# Find the Reference Angle 2.5pi

Subtract from .

The resulting angle of is positive, less than , and coterminal with .

Since is in the first quadrant, the reference angle is .

Find the Reference Angle 2.5pi