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ΣΣk=1+3+6+
Author:
Bunryu Kamimura
∑k(k-1)=(n-1)n(n+1)/3を使う。
GeoGebra
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カージオイド
正17角形 作図 regular 17-gon
アステロイド
6章⑥三角柱の展開図
standingwave-plus
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外接円→円周角の定理 Theorem of the angle of circumference
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JUZU
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