Four. Three corners to the base and the apex.
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A triangular-based pyramid has 4 corners, 4 faces and 6 edges.
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.
Depends what kind of pyramid. Triangular = 4 Square = 5
A hexagon based pyramid has 7 corners.
a triangular based pyramid has 4 faces.