There are infinitely many shapes and not all of them have names.
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A rectangle is one of many names in the classification of 2D shapes as are polygons
what are the 2d shapes of the real world
the cylinder has 2 2d shapes: the 2 circles on the end
Polygons are 2d shapes whereas polyhedrons are 3d shapes
2d shapes only have length and width, while 3d shapes have length, width and depth.