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正２０面体（黄金比）
Author:
Bunryu Kamimura
GeoGebra
New Resources
円の伸開線
standingwave-reflection-free
standingwave-reflection-fixed
正１７角形 作図 regular 17-gon
斜めドップラー
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第２章例題８
e^xのマクローリン展開
nijikukan
回転体(四角形)
接点の作る円は内接円
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Triangles
Expected Value
Pyramid
Incircle or Inscribed Circle
Parallelogram