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HKJHGJHG
Author:
chong yin tung
GeoGebra
New Resources
兩組對邊相等的四邊形
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
球體建築師
球体的体积推导（优化版）
Discover Resources
Quiz on Reflection 反射變換：測驗
圖形的內部、外部與周界
圓心角
我的第一个绘本
繪畫梯形
Discover Topics
Plane Figures or Shapes
Arithmetic Mean
Standard Deviation
Planes
Polygons