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正弦定理
Author:
yuchengda
GeoGebra
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兩位數除以一位數（一）
拼砌四邊形
柱體建築師
兩組對邊相等和有直角的四邊形
畫出對稱圖形
Discover Resources
IMO2015C
过圆上一点作切线，三步
雙曲線20160521
可积准则
初中数学
Discover Topics
Equilateral Triangles
Parametric Curves
Rectangle
Arithmetic Operations
Right Triangles