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問55

Author:嶋津恒彦

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正１７角形　作図　regular 17-gon 2
直線の軌跡
standingwave-reflection-free
sine-wave
対数螺旋

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六円六角形
正四面体
回転体（①三・四角）
F1 線分の移動でできる円錐
数A図形の性質P108練習37(1)

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Quadratic Equations
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Prism
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