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.
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A trapezium has 4 corners and it is a 4 sided quadrilateral
It has 4 corners.
A triangular-based pyramid has 4 corners, 4 faces and 6 edges.
Faces- 1 square (on the bottom) and 4 triangles (on each side) 5 Corners- same as sides 5 * * * * * A pyramid is a generic term. It has a polygonal base with n sides and n triangular faces meeting at an apex. So a triangle based pyramid (tetrahedron) has 4 faces and 4 corners. A quadrilateral based pyramid has 5 faces and 5 corners. In general, a pyramid with a n-sided polygon as base has n+1 sides and n+1 corners.
Depends what kind of pyramid. Triangular = 4 Square = 5