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polygon(first upload)
Author:
mingyi
GeoGebra
New Resources
画直线等分三角形的面积
球体的体积推导
畫出對稱圖形
三位數除以一位數（二）
四邉形 (四年級) 教師版
Discover Resources
Area of trapezoid
T4 Geobra
my math book
P54_3d
除法Q5
Discover Topics
Prism
Tangent Line or Tangent
Solids or 3D Shapes
Circumcircle or Circumscribed Circle
Multiplication