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过圆上一点作切线，三步
Author:
u.jianwang
GeoGebra
New Resources
四邉形 (四年級) 教師版
第八周作业
找出對稱軸
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
Discover Resources
整數÷整數_工作紙（一）_題2
畢氏定理動畫
semops_圓柱
矩形性质推论
普一甲詹詠宇4
Discover Topics
Logarithmic Functions
Curve Sketching
Similar Triangles
Kite
Incircle or Inscribed Circle