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證平行四邊形 (對角相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
畫出對稱圖形
判斷球體
球體建築師
拼砌四邊形
三位數除以一位數（一）
Discover Resources
Angles associated with Parallel Lines 平行線上的角
表示數線上的位置
算幾不等式
橢圓2--四圓心近似法
二階克拉瑪公式_找y
Discover Topics
Ellipse
Hypergeometric Distribution
Set Theory
Root
Kite