# Find the Reference Angle -(28pi)/9

Find an angle that is positive, less than , and coterminal with .
The resulting angle of is coterminal with but isn’t positive. Repeat the step.
The resulting angle of is positive and coterminal with .
Since the angle is in the second quadrant, subtract from .
Simplify the result.
To write as a fraction with a common denominator, multiply by .
Combine fractions.
Combine and .
Combine the numerators over the common denominator.
Simplify the numerator.
Move to the left of .
Subtract from .
Find the Reference Angle -(28pi)/9