A quadrilateral based pyramid.
There is no such 3-d shape if it also has flat faces.
There are 12 edges on a cube. There are 5 flat surfaces (planes) on a cube as well.
A pentagonal pyramid.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
Pyramid
a rectangle
A quadrilateral based pyramid.
A triangular prism has 5 flat faces.
There is no such 3-d shape if it also has flat faces.
There are 12 edges on a cube. There are 5 flat surfaces (planes) on a cube as well.
5 flat surfaces.
square based triangle
A pentagonal pyramid.
There are 5 flat surfaces.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).
A square based pyramid has 16 altogether, 5 faces (one of which is the base), 5 vertices, and 8 edges.