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The expression (a-4) represents the measure of an interior angle of a regular 20-gon. WHat is the value of a in the expression

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http://www.mathsisfun.com/geometry/interior-angles-polygons.html

I know the n-2 rule but on this question it says a-4 instead of -2 so that confuses me on what to do..

Would it be 22

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