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證平行四邊形 (對角相等)
Author:
W.L. Wong, Albert
GeoGebra
New Resources
判斷球體
三位數除以一位數（一）
兩位數除以一位數（一）
算柱 (兩位數)
画直线等分三角形的面积
Discover Resources
面积与面积问题
面積切割
兩圓
gyzpa 拋物面鏡的反射
Copy of 固定面積的圖形的周界變化
Discover Topics
Logarithmic Functions
Median Line
Limits
Perimeter
Trapezoid