Ellipse
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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.
A cylinder has a circular cross section that is parallel to its base.
A rectangular prism has a rectangular cross section whereas a cylinder has a circular cross section
A cylinder has a circular cross section, a square prism has a square cross section.
A circle, ellipse, truncated ellipse or rectangle - depending on the inclination of the cross section relative to the cylinder.
The radius of a cylinder is half the thickness of its circular cross section.
A cylinder has a circular cross-section whereas a cuboid has a quadrilateral cross-section.
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 that is parallel to its base.
A cylinder has a circular cross section, a rectangular prism has a rectangular cross section.
A rectangular prism has a rectangular cross section whereas a cylinder has a circular cross section
A cylinder has a circular cross section, a square prism has a square cross section.
A circle, ellipse, truncated ellipse or rectangle - depending on the inclination of the cross section relative to the cylinder.
The cross section of cylinder along its length (parallel to the axis of symmetry has the shape of a rectangle.
If the cylinder is standing on its flat face, the horizontal cross section is a circle. Otherwise, it is a line or a rectangle.
A cross section of a cylinder along its length is called a rectangle. When a cylinder is cut along its length, the resulting shape is a rectangle with a length equal to the circumference of the cylinder and a height equal to the height of the cylinder. The area of this rectangle represents the lateral surface area of the cylinder.
The radius of a cylinder is half the thickness of its circular cross section.
You cannot have a 2d cylinder. The 2d cross section will depend on the plane of the cross section.