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正四面体の内接球の半径のコピー

Author:satoumi, 嶋津恒彦

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正１７角形　作図　regular 17-gon 2
等積変形2
正１７角形　作図　regular 17-gon
直線の軌跡
目で見る立方体の2等分

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複素関数のグラフ
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