The usual notation is that the central letter is the point of the angle, so P is the answer.
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C
Exterior angle+interior angle=180 degrees and 180-exterior angle=interior angle
Interior angle 177.12 degrees Exterior angle 2.88 degrees
12
Exterior Angle = 360/number of sides. Interior Angle = 180 - Exterior Angle. Combining Interior Angle = 180 - (360/number of sides).