Cone
A cone is a basic shape in geometry. Several things have also been called cones on account of their shape:
- An ice cream cone is a container for ice cream, shaped like an inverted cone open at its base. It is often made of edible pastry.
- The scaly fruit-like reproductive bodies of certain plants, especially pines and cycads, are called cones: see conifer, conifer cone, and pinophyta.
- 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.
- 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.
- In geometry, cone is often used informally for conical surface, usually a right circular one.
- Also in geometry, the cone of an arbitrary set means the union of all line segments connecting a fixed point to points of . 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.
This is a disambiguation page; that is, one that points to other pages that might otherwise have the same name. If you followed a link here, you might want to go back and fix that link to point to the appropriate specific page.