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難問４（正方形）

Author:: Bunryu Kamimura

これも正三角形の作図がポイント

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音階と周波数
GHS1227
頂点の媒介変数表示
GHS1232
Ｂの極線は？

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チェバの定理
Ver.3
kepler-eq
ランダムウオーク
方べきの定理 3

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Isosceles Triangles
Parallelogram
Cosine
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