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餘弦定理
Author:
yuchengda
GeoGebra
New Resources
兩組對邊相等的四邊形
拼砌四邊形
兩組對邊相等和有直角的四邊形
畫出對稱圖形
兩位數除以一位數（二）
Discover Resources
未完成的版本
cycloid
circle
黃金三角形
旋轉正方形
Discover Topics
Probability
Cuboid
Trigonometric Functions
Tangent Line or Tangent
Trapezoid