The perimeter of the base of a cone is called the "directrix", and each of the line segments … See more

Volume The volume of any conic solid is one third of the product of the area of the base and the height In modern mathematics, this formula can easily be computed … See more

In projective geometry, a cylinder is simply a cone whose apex is at infinity, which corresponds visually to a cylinder in perspective appearing to be a cone towards the sky. In … See more

The definition of a cone may be extended to higher dimensions; see convex cone. In this case, one says that a convex set C in the real vector space is a See more