a quadrilateral
square
A square or quadrilateral.
A triagular based pyramid has 4 corners, 6 edges and 4 faces
The number of corners (or vertices) of a pyramid depends upon the shape of the base of the pyramid; a pyramid has one more corner than the number of sides in the base, eg a triangular based pyramid (also known as a tetrahedron) has 3 + 1 = 4 corners, a square based pyramid has 4 + 1 = 5 corners. A cone has 1 corner (at the top, or apex). So together a pyramid and cone have 2 more corners than number of sides of the shape of the base of the pyramid.
A triangular prism does!
square
A square or quadrilateral.
rectangle
A triagular based pyramid has 4 corners, 6 edges and 4 faces
A triagular based pyramid has 4 corners, 6 edges and 4 faces
A triangular pyramid has 4 corners and 6 edges (and 4 faces).
a square of course
4
Rectangle with round corners
A tetrahedron; a shape made of four triangles.
rectangle or square
A triangular prism does!