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.
A circle, ellipse, truncated ellipse or rectangle - depending on the inclination of the cross section relative to the cylinder.
An ellipse or a rectangle, depending on how you cut it.
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.
The shape of a transverse cross section of a cylinder is a circle.
A quadrant.
You cannot have a 2d cylinder. The 2d cross section will depend on the plane of the cross section.
A cylinder has a circular cross-section whereas a cuboid has a quadrilateral cross-section.
ovolo
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.
A cylinder has a circular cross section, a rectangular prism has a rectangular cross section.