triangle and square
4 triangles one square
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A pyramid shape, by default, has a square base. It therefore has 5 faces.
A square pyramid.
A square based pyramid.
The solid shape that has one square face and four triangular faces is called a pyramid. If you were to have a shape that had four triangular faces and no square face, it would be called a triangular pyramid.
Pyramid, but to be exact it would be a Triangular Pyramid ;) * * * * * To be exact ... but WRONG! A triangular pyramid has 4 faces and 4 vertices! A shape with 5 faces and vertices is a quadrilateral based pyramid - of which a special case would be a square based pyramid.