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fchengang动画1
Author:
符成岗
GeoGebra
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平行線的判定
双心四边形
龙形曲线-分形龙
比較五件物件的重量
撒针估算面积实验
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Task 5: Regular Hexagon
GGB10
Parabola_Vertical
圖形的周界
sin(x) 的函數圖形 官長壽老師
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Rectangle
Square
General Quadrilateral
Orthocenter
Symmetry