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.
A paper cup typically has three flat surfaces: the bottom, which is circular, and the two sides which are usually straight and flat. These surfaces are necessary for the cup to hold its shape and be able to stand upright.
5 Flat surfaces 4 flat surfaces (3 for the sides and 1 for the base).