A pyramid can have a polygon with any number of sides as its base. A triangular pyramid (tetrahedron, the Platonic solid) and the rectangular based pyramid (like the Egyptian ones) are better known, but that is simply a result of poor imagination.
If a pyramid has an n-gon as its base then it will have:
2 * n edges
n + 1 faces
and n + 1 vertices.
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A rectangular pyramid has 5 faces, 8 edges and 5 vertices.
A pentagonal pyramid has 6 faces, 6 vertices and 10 edges.
faces ,edges and vertices of a rectangular prism
A decagonal based pyramid will have 11 faces, 11 vertices and 20 edges
square pyramid has 5 faces, 5 vertices and 8 edges