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GeoGebra
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GeoGebra
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area between 4 circles
Author:
kidmancmw
GeoGebra
New Resources
双心四边形
科赫雪花
常见四边形是否是双心四边形
比較五件物件的重量
斐波那契螺旋弧线（表格法-可动态调节）
Discover Resources
vector1
周界(移邊)
三角碎形
圓錐截痕模型
酷狗音乐
Discover Topics
Polygons
Area
Constructions
Line Segment
Scalene Triangles