The cross section of a cylinder can be an ellipse when the cylinder is not aligned perpendicular to the plane of the cross section. Specifically, if the cylinder is oblique (tilted) relative to the cutting plane, the intersection can produce an elliptical shape. This occurs when the cutting plane intersects the cylinder at an angle other than 90 degrees, resulting in an elliptical cross section instead of a circular one.
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.
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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 sphere is three-dimensional whereas an ellipse is two-dimensional. An ellipse can have an oval shape but a cross section of a sphere is always circular.