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問57

Author:嶋津恒彦

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二次曲線と離心率
接点の作る円は内接円
standingwave-reflection-free
正１７角形　作図　regular 17-gon 2
standingwave-reflection

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方べきの定理Ⅲ
HH'線と３双曲線の交点の等距離共役点
数学　ひな祭り
傾きと点による直線
正四面体

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Geometry
Special Points
Cube
Pythagoras or Pythagorean Theorem
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