Well if the top it pointed i would call it a pyramid.
the sphere doesn't have a base because it's all round
base
A shape with a square base and four triangular sides is a pyramid.
is a prism named according to the shape of its base
A) Horse riding with no pants on b) intercourse with no lubrication c) trying to fit too much in or a square shape into a round shape.
sphere
Some are spherical (round), wereas others are more of a "smoothed" cylinder shape (i.e imagine a cylinder, but sand off the vertices, and curve the base slightly).
The simplest such shape is PYRAMID.
A pyramid.
cylinder
No, a cone is not a tetrahedron. A cone is a three-dimensional geometric shape with a circular base and a pointed vertex. A tetrahedron, on the other hand, is a four-sided polyhedron with triangular faces.