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（二）认识三角形和四边形
Author:
玖玖
GeoGebra
New Resources
Fibonacci Clock
Earth with coastline
兩組對邊相等和有直角的四邊形
國旗 (Claude 版)
直角坐標平面上的旋轉變換
Discover Resources
Contour Lines 等高線
Similar triangles
gjc099b34 找指定圓圓心
例题2（P点可拖动）
Copy of 分數與小數
Discover Topics
Orthocenter
Linear Equations
Real Numbers
Prism
Ellipse