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ptcc trigo level 2
Author:
Cheung Wing Chuen
GeoGebra
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球体的体积推导（优化版）
画直线等分三角形的面积
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
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球差曲线
Triangle Inequalities
樞紐問題
test1
鱼儿找食物
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Ellipse
Logic
Congruence
Orthocenter
Trapezoid