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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
球體建築師
算柱 (兩位數)
sanjiaohanshu
直角坐標平面上的旋轉變換
拼砌四邊形
Discover Resources
一元一次方程式
Equal chords and their distances from the centre
滾出直線滾出直線
軌跡四︰移動點與一固定直線保持固定距離(兩平行線)
向量分點公式
Discover Topics
Pyramid
Orthocenter
Similar Triangles
Trapezoid
Vectors 2D (Two-Dimensional)