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雙螺旋
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陳頤
GeoGebra
New Resources
多邊形的面積
正方形雪花图案
第八周作业3
撒针估算面积实验
折扣
Discover Resources
立方和
P4 四邊形
分數
Locus (Non parallel lines)
三角形三边关系探究
Discover Topics
Equilateral Triangles
Optimization Problems
Rectangle
Planes
General Quadrilateral