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6M2 圓周率的認識
Author:
sttsmath
,
GeoGebra Institute of Hong Kong
GeoGebra
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球体的体积推导（优化版）
兩位數加法
拼砌四邊形
柱體建築師
【案例】2013年安徽高考15题
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eye tracing
Verification of Pythagoras Theorem 驗証畢氏定理
八芒星
長方體透視圖(三頂點組成三角形)
变化的三角形的垂心.许兴华数学
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Square
Rectangle
Statistics
Matrices
Tree Diagrams