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三角形の外角角の二等分線

Author:聖徳

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正１７角形　作図　regular 17-gon 2
sine-wave
フーリエ級数展開
サイクロイド
カージオイド

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回転移動
共役な極と極線が作る四角形
円周角の定理
授業用天秤No.2
直方体の容器の変形

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Solids or 3D Shapes
Mathematics
Fractions
Rational Numbers
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