Add to .

The resulting angle of is positive and coterminal with .

Since the angle is in the third quadrant, subtract from .

Subtract from .

Find the Reference Angle -140 degrees

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# Find the Reference Angle -140 degrees

Add to .

The resulting angle of is positive and coterminal with .

Since the angle is in the third quadrant, subtract from .

Subtract from .

Find the Reference Angle -140 degrees