It is a squared based pyramid that fits the given description.
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Square - 1 face Circle - 1 face Triangle - 1 face
No. I has 3 triangle faces and one square face.
A square pyramid
One side of a square would be untouched with only 3 triangle faces attached to it. To make an entire closed shape, it would need another part or some 3 dimensional bending would need to take place. A pyramid has 1 square face and 4 triangle faces. A pyramid could also have 4 triangle faces where one triangle substitutes the square face.
The figure described is a polyhedron. It is a tetrahedron known as a triangular pyramid.