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正方形的旋轉
Author:
李春培
正方形的旋轉
GeoGebra
New Resources
拼砌四邊形
美國國旗 (Codex 版)
近似值：有效數字
Earth with coastline
兩組對邊相等和有直角的四邊形
Discover Resources
carrito
Apollonius Problem kissing coin problem
八芒星
例题2（P点可拖动）
小二 、小三 | 看時間
Discover Topics
Secant Line or Secant
Linear Equations
Numbers
Normal Distribution
Plane Figures or Shapes