It has a four sided square base and four other triangular sides reaching up to an apex.
It is a pentahedron.
If the four triangles are equilateral, it is known as a Johnson solid, and six of the pyramids will fit together to make an exact cube.
If the four triangles are not equilateral, then they are isosceles.
Chat with our AI personalities
-5
A quadrilateral based pyramid, of which a square based pyramid would be a special case.
If the base of the pyramid is square, it must have four triangular vertical faces in order to meet at the apex (top). Such a 3D shape is a "square pyramid".
A square pyramid.
A square based pyramid has 5 corners - 4 for the square and 1 for the top of the pyramid.