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20190220 Q2
Author:
Franky_0219
GeoGebra
New Resources
中华人民共和国国旗
常见四边形是否是双心四边形
斐波那契螺旋弧线（表格法-可动态调节）
双心四边形
撒针估算面积实验
Discover Resources
测试
橢圓軌跡04
angle between 2 planes 03
纏繞畫未完
指数函数的副本
Discover Topics
Planes
Conic Sections
Quadrilaterals
Straight Lines
Curve Sketching