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    Yohan Yukiya Seseㆍ사요한・謝雪矢 (youronlyone@c.im)'s status on Tuesday, 26-Sep-2023 12:30:40 JSTYohan Yukiya Seseㆍ사요한・謝雪矢Yohan Yukiya Seseㆍ사요한・謝雪矢
    in reply to
    • lori

    @lori Wow! I had to read that! ( https://en.wikipedia.org/wiki/Heptadecagon )

    Thank you for sharing!

    @actuallyautistic @actuallyadhd @autistics @autism

    In conversationabout a year ago from c.impermalink

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    1. Domain not in remote thumbnail source whitelist: upload.wikimedia.org
      Heptadecagon
      In geometry, a heptadecagon, septadecagon or 17-gon is a seventeen-sided polygon. Regular heptadecagon A regular heptadecagon is represented by the Schläfli symbol {17}. Construction As 17 is a Fermat prime, the regular heptadecagon is a constructible polygon (that is, one that can be constructed using a compass and unmarked straightedge): this was shown by Carl Friedrich Gauss in 1796 at the age of 19. This proof represented the first progress in regular polygon construction in over 2000 years. Gauss's proof relies firstly on the fact that constructibility is equivalent to expressibility of the trigonometric functions of the common angle in terms of arithmetic operations and square root extractions, and secondly on his proof that this can be done if the odd prime factors of N ...
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