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There are: 0.5*(15^2 -3*15) = 90 diagonals in a 15-agon polygon
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Related questions
How many diagonals in a 15 gon?
1/2*15*(15-3) = 90 diagonals.
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How many diagonals does a 33-gon have?
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How many diagonals of a 12-gon have?
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How many diagonals are in a 20-gon?
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How many diagonals does the 13 gon?
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