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練習 - 逆時針旋轉（三角形）
Author:
Lau Sir
Topic:
Triangles
GeoGebra
New Resources
長方體平面投影 (Codex版)
Earth with coastline
兩組對邊相等的四邊形
兩組對邊相等和有直角的四邊形
小数 的副本
Discover Resources
畢氏定理證明
PA + PB
圖形的周界
杨辉三角
平面切割正立方體
Discover Topics
Reflection
Natural Numbers
Expected Value
Quadratic Equations
Linear Equations