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The nickname the layperson uses for the mouthful “icosikaipentagon”—the mathematical name for a 25-sided polygon or 25-gon.
“How many diagonals are there in an X-gon?” was one of the twenty-five Christmaths questions math geeks had to answer at a recent math competition held in Singapore.
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by MathPlus December 25, 2017
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