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正四面体の内接球の半径

Author:嶋津恒彦

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standingwave-reflection-free
standingwave-reflection
６章⑥三角柱の展開図
円の伸開線
対数螺旋

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TriangleFiveCenter
立体の見え方
数学ⅠＡⅡＢ演習β第１講　3番
平均変化率から微分係数
正１７角形　作図　regular 17-gon 2

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Integers
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