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Finding Principal Angles

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

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

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

Find the principal angle for -135 degrees.

Find the principal angle for -270 degrees.

Find the principal angle for -720 degrees.

Find the principal angle for 540 degrees.

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

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

Find the principal angle for -45 degrees.