A square pyramid.
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a square pyramid
Four(4). It is formally named as a 'tetrahedron'. There is the triangular base ; one side. and three triangular faces m aking for a total of four faces. A square based 'pyramid' is formally a 'pyramid'. A square base and four triangular faces.
A tetrahedron. It looks like a puramid with a triangle for a base insted of a square.
A pyramid can have 0 or 1 square faces. It can have 4 or more faces - there is no limit.
More correctly it is a 'Tetrahedron'. A Tetrahedron is a solid object with '4' (four) triangular faces. The Pyramids of Egypt are NOT tetrahedrons, because they have five(5) faces. made up of 4 triangular faces ( which you see) , and a SQUARE BAse (5th face) which they are built on.