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工具：PlaneArrows, PlaneText... (v.2)
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
New Resources
拼砌四邊形
兩組對邊相等和有直角的四邊形
直角坐標平面上的旋轉變換
兩位數除以一位數（一）
畫出對稱圖形
Discover Resources
mmvbcvbcv
平行四邊形對角線
Ex.2
指數與對數函數
Copy of 和差角公式几何证明
Discover Topics
Diagrams
Subtraction
Conic Sections
Incircle or Inscribed Circle
Scatter Plot