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A cylinder is a long, thin shape where the ends are circles. Any cross-section of a cylinder at right angles to its outer surface is also a circle.
Long cylinders are also known as tubes. Pipes are also cylinders. The cylinder you see the most often is, of course, the cardboard tube at the centre of a roll of toilet paper.
Long cylinders are also known as tubes. Pipes are also cylinders. The cylinder you see the most often is, of course, the cardboard tube at the centre of a roll of toilet paper.