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固定周界長方形的面積變化（二）
Author:
Anthony OR 柯志明
,
GeoGebra Institute of Hong Kong
Topic:
Area
GeoGebra
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畫出對稱圖形
四邉形 (四年級) 教師版
Fibonacci Clock
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直角坐標平面上的旋轉變換
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P.4不規則圖形的周界
ghseh 二次函數描點法
正方形與長方形
自學材料_兩位數乘兩位數
椭圆的定义
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Cylinder
Normal Distribution
Secant Line or Secant
Geometric Mean
Intersection