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過點切圓的動圓圓心軌跡
Author:
Wu Xiao-Ren
GeoGebra
New Resources
Earth with coastline
近似值：有效數字
找出對稱軸
Fibonacci Clock
畫出對稱圖形
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圖四
三角形
gjc100a34 兩三角形重疊面積比
兩正方形重疊的形狀(配合習作40頁)
绘制平面区域内整点的两种方法
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Tangent Line or Tangent
Fractal Geometry
Function Graph
Parabola
Subtraction