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平行四邊形的面積
Author:
whtong
GeoGebra
New Resources
球体的体积推导（优化版）
四邊形的特性
兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
畫出對稱圖形
Discover Resources
Meaning of Negative Indices 負指數的意義
分數與小數
廣義三角函數的換算
改變係數觀察多項式圖形
圆周展开
Discover Topics
Random Experiments
Arithmetic Mean
General Quadrilateral
Calculus
Hypothesis Testing