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A circle, ellipse, truncated ellipse or rectangle - depending on the inclination of the cross section relative to the cylinder.
Ellipse * * * * * At right angles to the length, it would be a circle. Along the length it would be a rectangle. Only a diagonal cross section would be an ellipse.
Holding the knife at different angles, you could cut a cylinder and get a circle, an ellipse, or a rectangle.
If it a right cone then it is a circle, otherwise an ellipse.
A cylinder has a circular cross section that is parallel to its base.