For example, in the prism below, the cross section is a hexagon. This is called a hexagonal prism. Some 3D shapes, like cubes and pyramids, can be opened or unfolded along their edges to create a ...

A 3D shape with all straight edges and flat faces is a polyhedron. Other 3D shapes ... of a prism are the congruent polygon ‘ends’, plus the rectangles that join them. The number of ...