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Two dimensions (2D) is a shape that has a length and width. For instance, draw a square on a piece of paper and it is in 2D.
It means two dimensional such as the shape of a polygon or a rectangle that has dimensions of length and width.
No, a quadrilateral can not have 3 dimensions, it's a 2d shape, a 3d shape can be made out of quadrilaterals, and usually is partially (if it's man-made) , but no, it CAN'T have 3 dimensions no matter what
A shape in 2D with n sides is called an n-gon. In higher dimensions, a shape with n sides is called an n-sided polyhedron.
this is the shape of 2d cone