It could be a rectangle-based pyramid.
A square pyramid
A cuboid.
One - a rectangle is a flat shape - not a three dimensional object !
A rectangle is a two-dimensional shape, so it doesn't have faces in the way that three dimensional shapes have. A rectangle has four edges and four corners.
A rectangle is a two-dimensional shape, so it has no faces, vertices, or edges in the three-dimensional sense. However, if we consider a rectangular prism (a three-dimensional object), it has 6 faces, 8 vertices, and 12 edges. The rectangle itself, being flat, is defined by its four sides (edges) and four corners (vertices).
A rectangle is a two-dimensional shape and does not have vertical faces. Instead, it has four edges and four vertices. If you are referring to a rectangular prism (a three-dimensional shape), it has six faces, with four of those being vertical.
A cube
A pyramid with a square base.
A circle has no faces. In geometric terms, a face refers to a flat surface that forms part of the boundary of a three-dimensional object. Since a circle is a two-dimensional shape, it does not possess any faces.
Because a rectangle is not three-dimensional it does not contain a volume but an area. A geometrical figure that is more efficient than a rectangle for area is a circle.
A rectangle has no curved faces; it has four straight edges and four right angles. It is a polygon with a flat, two-dimensional shape. If you are referring to a three-dimensional shape like a rectangular prism, it still does not have any curved faces, as all its faces are rectangular.
Length, Width, Height. Faces, Corners and sides.