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Concave lens light bending
Author:
Tsui Hok
GeoGebra
New Resources
拼砌四邊形
画直线等分三角形的面积
三位數除以一位數（二）
球体的体积推导
兩組對邊相等和有直角的四邊形
Discover Resources
Demonstration of the angles at the same segment
排列
串珠(大小不同)
軌跡 直線 (與兩平行線等距)
金惠吉：三维李萨如
Discover Topics
Sequences and Series
Geometry
Cuboid
Exponent
Multiplication