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GeoGebra
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活动三：应用性质
撒针估算面积实验
折扣
比較五件物件的重量
斐波那契螺旋弧线（表格法-可动态调节）
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扇形概念與面積
說明用01
面積3
等腰三角形
Congruent Triangle (SSS)
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Geometric Distribution
Subtraction
LCM and GCD
Quadrilaterals
Polygons