A problem from an old @CruxMathematicorum https://www.cut-the-knot.org/m/Geometry/DiagonalsInPolygon.shtml … #FigureThat #math #geometrypic.twitter.com/HkQ3Mhl2Jc
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By contradiction, not all diagonal lines in a 2n gon have a side to which they are parallel.
My third tweet should say 1+2*(n-1) not 3+2*(n-1) sorry.
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