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錯角---不平行綫
Author:
chanfushun
GeoGebra
New Resources
平行線的判定
双心四边形
龙形曲线-分形龙2
异形操场
GeoGebra数学资源(4-8年级)
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美麗的萬花筒
固定三角形的條件−題2
進入拋面的平行光會反射至焦點
固定周界長方形的面積變化(二)
Copy of Quiz on Compass Bearings
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Rectangle
Equations
Ellipse
Parabola
Centroid or Barycenter