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三等分点连线围成的小三角形
Author:
夜雨嘀嗒
GeoGebra
New Resources
常见四边形是否是双心四边形
折扣
三角函数 的副本
比較五件物件的重量
盈利與虧蝕
Discover Resources
磁磚著色
物件顯示條件
中心对称的概念
Drag A or X
Statistical calculator 2
Discover Topics
Subtraction
Area
Pythagoras or Pythagorean Theorem
Rotation
Isosceles Triangles