SOLUTION: find the sum of an exterior angle of a regular 20-gon

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Question 241576: find the sum of an exterior angle of a regular 20-gon
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
Let an exterior angle be a.
The sum of the angle is a.
Now if you wanted the sum of all the exterior angles you should have said so but You asked for the sum of one (an is singular) exterior angle.
Part of math is learning its language.