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三角形を回転させると？
Author:
井上直紀
GeoGebra
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正１７角形 作図 regular 17-gon
小テスト
standingwave-reflection-free
正１７角形 作図 regular 17-gon 2
等積変形2
Discover Resources
等積変形
立方体の裏返し（筒化）
回転体東大
計量
楕円と折り紙
Discover Topics
Centroid or Barycenter
Expected Value
Trigonometric Functions
Complex Numbers
Means