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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
Earth with coastline
拼砌四邊形
找出對稱軸
算柱 (兩位數)
小数 的副本
Discover Resources
gyzqx 共頂點的圓錐曲線
國旗
乘法的副本
拋物線3-平行四邊形法
根據百分率找數量（一）:例1的副本
Discover Topics
Rotation
Hyperbola
Definite Integral
Poisson Distribution
Parabola