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（二）认识三角形和四边形
Author:
玖玖
GeoGebra
New Resources
畫出對稱圖形
兩組對邊相等的四邊形
第八周作业
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
Discover Resources
linear function
阿基米德求圓面積
分線比值
切割圓面積的副本
漂亮的摇摆曲线
Discover Topics
Standard Deviation
Orthocenter
Rectangle
Integral Calculus
Tangent Line or Tangent