The sides are Triangles, the bottom is a square on a regular pyramid.
Another answer: Faces
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A four sided pyramid is called a square based pyramid. It has a square base and four sides,(called edges,) that join at the apex. (the top of the pyramid.)
A hexagonal pyramid.================A pyramid with 7 faces has a base plus 6 triangular sides, so is called a hexagonal pyramid.
A triangular pyramid is usually called a tetrahedron; its base is an equilateral triangle, as are the other three of its sides. An Egyptian pyramid has a square base; the other four sides are isosceles triangles.
A three sided trangle
A rectangular pyramid has five sides