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In [[mathematics]], a '''right circular cone''' is the surface, located in the three dimensional space, formed by rotating one [[line]]s about another line that intersects it at an angle that is not the right angle. The point where the two lines intersect is the vertex.
The intersection of a plane with this object forms an important set of two dimensional curves, called the [[conic section]]s.
Cones in general do not have to be "right" or "circular", and may be truncated, i.e., not extend to infinity. A familiar example of a (doubly) truncated cone is a basketball net.
The volume of a cone is equal to the product of the base, height, and one third.
:<math>Volume = \frac{1}{3} b h</math>
[[Category:Geometry]]