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鳩の巣原理_正方形（分割あり）
Author:
伊藤克典
GeoGebra
New Resources
目で見る立方体の2等分
対数螺旋
sine-wave
接点の作る円は内接円
standingwave-reflection-free
Discover Resources
円の面積
Colorful Rain
ex20170209
放物線とその焦点
幾何１完成ノート96
Discover Topics
Real Numbers
Sphere
Logarithmic Functions
Line Segment
Right Triangles