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正三角形の辺上を動く点と角

Author:Naofumi Horio

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接点の作る円は内接円
standingwave-reflection-free
コイン投げと樹形図
目で見る立方体の2等分
直線の軌跡

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内心→垂心→外心
外接円の半径
算法天生法指南二之巻(61)解答
一次関数（動点と三角形の面積）のコピー
楕円に外接する四角形の性質

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Parametric Curves
Exponent
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Pythagoras or Pythagorean Theorem

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