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四下：三角形内角和（折叠法）
Author:
钟秀群
GeoGebra
New Resources
兩位數加法
三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
球體建築師
Discover Resources
Building Cylinders 建造圓柱體
HKMO 2013 Question 3 Demonstration (Geometric Construction)
Properties of a Rectangle
圖形拼砌
探索金字塔高度
Discover Topics
Definite Integral
Sphere
Square
Probability
Difference and Slope