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餘弦定理
Author:
yuchengda
GeoGebra
New Resources
找出對稱軸
算柱 (兩位數)
拼砌四邊形
錐體建築師
三位數除以一位數（一）
Discover Resources
三角形數
正三角形
Tangent properties
放射狀旋轉圖形(2)
直線的斜率
Discover Topics
Circumcircle or Circumscribed Circle
Equilateral Triangles
Isosceles Triangles
Cone
Inequalities