It has 4 corners.
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A triangular-based pyramid has 4 corners, 4 faces and 6 edges.
A hexagon based pyramid has 7 corners.
A three dimensional triangle is also known as a pyramid. In a triagonal pyramid, there are six edges and four corners.
Four. Three corners to the base and the apex.
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.