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Finding Principal Angles

Find the principal angle for -45 degrees.

If an angle is 1080 degrees, what is its principal angle?

Find the principal angle for -270 degrees.

If an angle is -990 degrees, what is its principal angle?

If an angle is 720 degrees, what is its principal angle?

Find the principal angle for -720 degrees.

If an angle is 420 degrees, what is its principal angle?

Find the principal angle for 540 degrees.

If an angle is -720 degrees, what is its positive principal angle?

Find the principal angle for -135 degrees.