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S0E8 一线三等角
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GeoGebra
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圓的切線方程
活动三：应用性质
科赫雪花
正方形雪花图案
撒针估算面积实验
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堆疊(圓、正方形、正三角形)
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三角形的面積的副本
自製工具：CurveFit, Bezier
比較五件物件的重量
Discover Topics
Area
Geometry
Linear Programming or Linear Optimization
Function Graph
Rhombus