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Circle Area (By Peeling!)
Author:
lu xinsheng
GeoGebra
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圓的基本性質
活动三：应用性质
斐波那契螺旋弧线（表格法-可动态调节）
折扣
双心四边形
Discover Resources
斜率 - 概念及定義 (1)
題1
quadrilaterals 1
p10-4
包路線
Discover Topics
Vectors
Scalene Triangles
Arithmetic
Derivative
Cylinder