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題一

Author:GeoGebra Institute of Hong Kong

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四邊形的特性
球體建築師
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
画直线等分三角形的面积

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已知橢圓 x^2/a^2+y^2/b^2=1 (a>b>0)
四連桿(可調)
圓與三角形中點的軌跡
三角形外心的角度關係
旋轉正方形

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Combinatorics
Secant Line or Secant
Vectors 3D (Three-Dimensional)
General Quadrilateral
Parallelogram

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