A cube
triangular prism
a cylinder
A cylinder, depending if you think the curved part that goes around counts..
sphere
Cylinder
They are straight lines where two plane faces of the shape meet. The definition is sometimes extended to curved lines where curved (3d) faces meet such as at the base of a cone.
A 3D shape that has 6 edges is called a hexagonal prism.
A common 3D shape that is not a polyhedron is a sphere. Unlike polyhedra, which are formed by flat polygonal faces, a sphere is characterized by its smooth, curved surface and has no edges or vertices. Other examples of non-polyhedral 3D shapes include cylinders and cones, which also feature curved surfaces.
square based triangle
a circle
A cone would fit the given description
cone