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凹四边形
Author:
张老师
GeoGebra
New Resources
平行線的判定
折扣
撒针估算面积实验
异形操场
斐波那契螺旋弧线（表格法-可动态调节）
Discover Resources
色彩視覺藝術
Rotation
三角測量02
襯墊
時距計算機
Discover Topics
Vectors 2D (Two-Dimensional)
Cube
Square
Ellipse
Functions