a rectangle or square
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A cylinder is a solid figure that can both roll and slide. Its shape and symmetry allows it to roll smoothly along a surface, and its circular base provides stability for sliding. Both of these properties make it suitable for applications such as wheels and rollers.
identify 3-dimensional shapes? cone,prism,,pyramid,cylinder,and sphere?
A rectangular solid is 3-dimensional, but I'm assuming you mean a 2-dimensional representation of a rectangular solid, which is called a net. Do a search for the following: "net rectangular prism" and you will see a drawing of it.
The answer depends on whether the shape is 2-dimensional or 3-d. For a 2-dimensional polygon with n sides, the minimum number is n-3 diagonals.