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Author:
郭萌
GeoGebra
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龙形曲线-分形龙
双心四边形
活动三：应用性质
斐波那契螺旋弧线（表格法-可动态调节）
科赫雪花
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龍騰4_1-1課進7
三角形内角和演示
angle
周界平移
活工(三)Q2
Discover Topics
Similar Triangles
Histogram
Logarithmic Functions
Geometric Transformations
Derivative