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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
球體建築師
兩組對邊相等的四邊形
畫出對稱圖形
球体的体积推导
Discover Resources
色彩視覺藝術：奇幻光圈
擴分、約分及比較大小
平行線 (同位角 - 1對)
【物理】引力波
繪畫梯形
Discover Topics
Constructions
Orthocenter
Unit Circle
Line Segment
Cuboid