If you're talkin about sumthin like a soup can then its a cylinder
It is a cylinder since it has three bases of measurement rather than the two that a circle has.
A rainbow is an example of an arc shape, as is any object or drawing that has a curve conforming to a section of the the circumference of a circle.
Ah, a cube is a wonderful shape with 12 edges in total. Now, when we talk about horizontal edges specifically, we're looking at the edges that run parallel to the ground, and a cube has 4 of those lovely horizontal edges. Just imagine those edges catching the light and creating beautiful shadows as they sit so peacefully on the tabletop.
A square or rectangle has all right angles. More complex shapes can also have all right angles, notably forms such as the outline "cross" (e.g. Red Cross), which is an irregular dodecagon having twelve sides. The Greek cross is equilateral, the Latin cross is not.
It is sometimes referred to as the shape's "plan".
The cross section of cylinder along its length (parallel to the axis of symmetry has the shape of a rectangle.
You cannot have a 2d cylinder. The 2d cross section will depend on the plane of the cross section.
A circle
A square.
a circle
a rectangle.
A square.
a square
An ellipse or a rectangle, depending on how you cut it.
It will be a rectangle
A cylinder is a three dimensional shape with a uniform circular cross section and a finite length.