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the cylinder has 2 2d shapes: the 2 circles on the end
what are the 2d shapes of the real world
the answer is 8
2 dimensional shapes are 2D shapes and polygons are plain shapes with no curves. So some 2D polygons would be squares , rectangle and many more . A circle would not be a 2D polygon.
There are infinitely many shapes and not all of them have names.