A square-based pyramid.
A right square based pyramid.
A shape with 5 sides is a pentagon
PENTAGON
A pentagonal pyramid.
5 sides.
A square-based pyramid.
A right square based pyramid.
A shape with 5 sides is a pentagon
If it's 3D then it could be a rectangular pyramid.
A shape with 5 sides is a pentagon
Pentagon.
PENTAGON
A pentagonal pyramid.
An irregular pentagon
A quadrilateral is a plane or 2d figure with four sides. A 3d shape (object) has a name ending with -hedron, eg a tetrahedron which is a four sided 3d shape. A 3d quadrilateral has no meaning. Sides (edges) do exist in 3d shapes, but a more pertinent attribute is faces. Do you mean by "3d quadrilateral" a 3d shape which has a quadrilateral as a base and at most 4 or 5 other sides, ie a pentahedron (usually called a square pyramid) or a hexahedron (some types of which are called cuboids and cubes)? Please re-ask using consistent terminology, eg What is a 3d shape with one pair of parallel faces and 6 faces?
A flat pentagon. Or some kind of circle pentagon breed...