The Pyramid
A pyramid has 4 flat faces, all of which are triangular. Don't confuse this with a square-based pyramid like those in Egypt, as they have 5 faces.
There are many such shapes: a sphere, ellipsoid, toroid all have no flat faces. Any one of the intersected by one plane will have one flat face, if intersected by two planes, there will be two and so on. Amongst polyhedra, only a tetrahedron (or triangular prism) fas fewer than 5 flat faces.
It has 5 flat faces because there are 4 flat faces at the top and 1 flat face at the bottom.
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A rectangular prism is solid 3-dimensional object which has six faces that are rectangles. It has 12 edges and 8 vertices.
A triangular prism has 5 flat faces.
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a pyramid
rectangular pyrimid
A rectangular pyramid (four-sided base) has 5 faces and 5 vertices.
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