To do something in way that is the cheapest and easiest.
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Five
Irregular Pentagon
If you mean the base has 4 sides then the pyramid is a square based pyramid and has 5 corners. If you mean the pyramid has 4 faces then the pyramid is a tetrahedron with a triangular base and has 4 corners.
a square with 3/4 of its corners cut off
Cut the corners off of a square or rectangle, but do so from points that are not near the centers of each side.