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鈍角の三角比（定義）
Author:
Tetsuya Akazawa
GeoGebra
New Resources
standingwave
正１７角形 作図 regular 17-gon 2
対数螺旋
正１７角形 作図 regular 17-gon
カージオイド
Discover Resources
接線と小円
円周率を求める
応用２
Radius演習21
接点の作る円は内接円
Discover Topics
Area
Geometry
Conditional Probability
Trigonometry
Centroid or Barycenter