Cone

A cone is a basic shape in geometry. Several things have also been called cones on account of their shape:

A volcanic cone is a mountain formed by material ejected from a volcanic vent.

In relativity, the light cone of an event consists of all spacetime events that can interact with it.

The scaly fruit-like reproductive bodies of certain plants, especially conifers (Pinophyta) and cycads (Cycadophyta), are called cones: see conifer cones, and Pinophyta.

In vertebrate anatomy, a cone cell is a type of light-sensitive cell found along with rods in the retina of the eye.

In ceramics manufacture, a cone is a conical or pyramidal mineral stick that is used to gauge the temperature of an oven.

An ice cream cone is a container for ice cream, shaped like an inverted cone open at its top. It is often made of edible pastry.

A traffic cone is a brightly colored cone-shaped plastic object commonly used as a temporary traffic barrier or warning sign.

In basketball, a cone is a player who is so slow and unskilled, that you can dribble around them as if they were a traffic cone.

The word cone and its derivatives also have several specialized meanings in mathematics:

In geometry, cone is often used informally for conical surface, usually a right circular one; see cone (geometry).

Also in geometry, the cone of an arbitrary set X means the union of all line segments connecting a fixed point to points of X. For exmple, this coning operation will turn a triangle into a tetrahedron.

In topology, too, coning may be applied to a topological space, e.g. to define the barycentric subdivision of a cell complex; see cone (topology).

In linear algebra, the convex cone of a set of vectors consists of all linear combinations of those vectors with non-negative coefficients.

In descriptive geometry, "conical projection" is another name for the perspective projection.

In cartography, however, a conical projection maps the spherical surface of the Earth to a conical surface, that is then unrolled onto a plane.

A conic section is any curve obtained by cutting the surface of a cone (more precisely, a conical surface) by an arbitrary plane.

The formula for the volume of cone is 1/3(Area of Base)(height) = 1/3 π r2 h

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