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Perigal's Dissection
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
New Resources
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
GeoGebra笔记功能体验课件
球体的体积推导（优化版）
画直线等分三角形的面积
Discover Resources
Quiz on Compass Bearings 羅盤方位角：測驗
Cross sections of cube
數字的加減數線表示
圓系
扇形滚动(圆心角半径可变)
Discover Topics
Statistical Characteristics
Pyramid
Random Variables
Geometric Transformations
Orthocenter