A square!
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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
It looks the same as a normal pyramid, the only difference is the base of the pyramid is square.
A pyramid has 1 square base.
A shape with a square base and four triangular sides is a pyramid.