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projection2plane-vector
Author:
wenping168
GeoGebra
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常见四边形是否是双心四边形
撒针估算面积实验
圓的基本性質
折扣
活动三：应用性质
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劉徽的「割圓術」
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相似形_Collection
變化圖形製作
sin(x) 的函數圖形的副本
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Function Graph
Cuboid
Equilateral Triangles
Orthocenter
Calculus