4 at the base and 1 at the top
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A trapezium has 4 corners and it is a 4 sided quadrilateral
it is a 4 sided polygon with 4 corners.
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.
There isnt one
0 or 4 corners