Total of exterior angles of a plane figure is always 360 degrees so 360/20 = 18 degrees. Alternatively interior angles of n sided figure always total (2n -4) right angles. In this case n = 20 so total interior angles = 36 right angles ie 3240 degrees and each angle = 3240/20 ie 162 degrees. Subtracting this from 180 gives 18 degrees. QED
Chat with our AI personalities
Providing that it's a regular polygon then each exterior angle will measure 12 degrees.
56
400 exterior angle = 360/9 = 400
999999
60 degrees