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Sum of interior angles of ANY n-sided pentagon is (2n - 4) right angles, so 100 - 4 = 96 right angles ie 8640 degrees and each angle = 8640/50 = 172.8 degrees. Alternative method: Total exterior angles = 360 degrees so each in 50-gon is 360/50 ie 7.2 degrees. Interior angles are therefore 180 - 7.2 ie 172.8 degrees.

Q: What is the angle measure for each of the angles on a regular 50 - gon?

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