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平移動畫（平移加滑桿）
Author:
311016
GeoGebra
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找出對稱軸
近似值：有效數字
四邊形的特性
sanjiaohanshu
兩組對邊相等的四邊形
Discover Resources
內心
小学数学
點之極線定理 / polar of a point theorem
三角形的內心
平面直角坐标系
Discover Topics
Quadrilaterals
Linear Functions
Translation
Subtraction
Arithmetic