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證平行四邊形 (對角線互相平分) (對邊 // 且相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
四邊形的特性
拼砌四邊形
近似值：有效數字
算柱 (兩位數)
Discover Resources
parallelogram and squares
三度空間中的長方體
Copia de 模版 - 無框黑板
排數咭遊戲_多位數
S3 Ch4.3 試做4.6b 三視圖(3D圖)
Discover Topics
Secant Line or Secant
Perimeter
Coordinates
Hypothesis Testing
Congruence