It looks the same as a normal pyramid, the only difference is the base of the pyramid is square.
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A square!
If it is a pyramid, then the base shape is a SQURE. If it is a tetrahedron, then the base shape is a triangle.
It will be a square shape if it is a squared based pyramid
If the base of the pyramid is square, it must have four triangular vertical faces in order to meet at the apex (top). Such a 3D shape is a "square pyramid".
The sides are triangular in shape.