square rectangular
It can be any polygon shape, depending on how many sides the pyramid has. A four sided pyramid would have a quadrilateral (like a square or a rectangle) base, for instance.
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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
No, the base of a pyramid must be a 2-dimensional shape so no polyhedron can be its base.
A square!
It is any polygonal shape.