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.
cut corners
Verticies are corners Assuming you mean a diamond as in a quadrilateral polygon then there are four corners If you mean a diamond as i a precious stone, the answer would depend on how the diamond had been cut.
fold it in half and cut it the corners
You dont.External corners are mitred,while internal corners are scribed.
Some rolling papers have cut corners on a sheets leading edge. These missing corners make it easier to start your paper into a hand roller, especially in hard conditions like wind, semi-darkness.
fold the paper and cut off all the corners
bcuz they can cut corners
Cut corners and run when nobody is looking
cut corners
A trillion cut stone is a gemstone cut in a triangular shape with pointed corners, usually with 31 or 50 facets. The cut is designed to maximize the stone's brilliance and fire.
By "corners", do you mean vertices or edges?
Adjacent corners of a square share one side. Opposite corners share no sides.