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離心率
Author:
Yusuke Kato
GeoGebra
New Resources
アステロイド
sine-wave
サイクロイド
standingwave
目で見る立方体の2等分
Discover Resources
円と直線の交点
Demo
透視
等力点とフェルマー点（正三角形）
正葉曲線
Discover Topics
Geometry
Polygons
Angles
Power Functions
Logic