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 pyramid with a square base.
A cube
Length, Width, Height. Faces, Corners and sides.
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.
The shape described is a triangular prism.
No, they are two dimensional representations of three dimensional solids.
Geometric space is three dimensional and infinitely large.
A rectangular prism is a three dimensional object, all of whose six faces are rectangles. Two of them may be squares.