The answer depends on where a plane cuts through the cylinder. It could be a circle, ellipse, rectangle or square.
Not sure what the projection on a plane at an angle to the length of the cylinder would be. A parabola?
Plus there are other section where the
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the cylinder has 2 2d shapes: the 2 circles on the end
A cylinder is not a 2D object because it has three dimensions - length, width, and height. It has a circular base and a curved surface, which give it depth. A 2D object would only have two dimensions and would lack any depth or thickness.
a circle is a 2D shape while a cylinder is 3D shape
2D, a cube would be 3D
You maybe thinking of a 3D cylinder whose 2D net would fit the given description