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三心
Author:
施宗緯
GeoGebra
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中华人民共和国国旗
撒针估算面积实验
常见四边形是否是双心四边形
科氏力 (Coriolis Force)
斐波那契螺旋弧线（表格法-可动态调节）
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Difference of Two Squares 平方差 (2)
Clock
有向角
立體圖形 KH
三视图积木
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Perimeter
Quadrilaterals
General Quadrilateral
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Vectors