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Perimeter
Author:
Janice Wong
,
Anthony OR 柯志明
GeoGebra
New Resources
直角坐標平面上的旋轉變換
拼砌四邊形
兩位數除以一位數（二）
算柱 (兩位數)
三位數除以一位數（二）
Discover Resources
緯度、日照、影長
指數與對數
椭圆的两条垂直切线的交点轨迹
金惠吉：正弦交流电演示
test
Discover Topics
Arithmetic Operations
Integers
Linear Equations
Root
Orthocenter