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fcg振幅变换
Author:
符成岗
GeoGebra
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活动三：应用性质
常见四边形是否是双心四边形
斐波那契螺旋弧线（表格法-可动态调节）
科赫雪花
直線的斜率：水平變化 & 鉛垂變化
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畢氏定理倒水法
Apollonius Problem poncelet fouche
angles sum on a striaght line
正八角錐(旋轉，實體、透視)
一个二次函数图像
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Coordinates
Linear Equations
Parametric Curves
Translation
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