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Quiz on Projection of a Line Segment on a Plane 投影：測驗
Author:
Alex CHIK
GeoGebra
GeoGebra 互動數學教室
http://www.geogebra.hk
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漂亮的摇摆曲线
平行線的斜率
画直线等分三角形的面积
球体的体积推导
三位數除以一位數（二）
Discover Resources
將數列化為級數（文字）
先估算，後看解釋
疊代三角形
面積趣味題
椭圆的光学性质
Discover Topics
Circumcircle or Circumscribed Circle
Cuboid
Vectors
Difference and Slope
Terms