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圆展开---探究圆周率
Author:
陈宜红
GeoGebra
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龙形曲线-分形龙
撒针估算面积实验
异形操场
斐波那契螺旋弧线（表格法-可动态调节）
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認識函數
弦心距比較
證平行四邊形 (對邊相等)
How to reconstruct a quadrilateral farm to a triangular one with the same area?
量角器
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Plane Figures or Shapes
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Geometric Transformations
Integral Calculus