Cone

From Encyclopedia Jr, free information reference for Kids

Cone (from the Greek κώνος, Latin conu) is a basic geometrical shape. It may also refer to:

• Volcanic cone, a mountain formed by material ejected from a volcanic vent
• Conifer cone, a seed-bearing organ on conifer plants
• Cone cell, in anatomy, a type of light-sensitive cell found along with rods in the retina of the eye
• Pyrometric cone, in ceramic manufacture, a contolled mixture of minerals used to gauge the extent of firing
• Ice cream cone, a container for ice cream, shaped like an inverted cone open at its top
• Traffic cone, a brightly colored cone-shaped plastic object commonly used as a temporary traffic barrier or warning sign
• Cone, the name given to an optical fibre that tapers almost to a point
• Cone, a part of a loudspeaker that moves the air, creating sound waves
• Gastropods (snails) of the genus Conus.

In mathematics:

• Cone (geometry), the basic shape
• The cone of an arbitrary set X means the union of all line segments connecting a fixed point to points of X. For example, this coning operation will turn a triangle into a tetrahedron.
• Conic solid, the cone of a plane figure.
• Projective cone, a similar (but more general) concept in projective geometry
• Conical surface, generated by a moving line with one fixed point
• Conic section, any curve obtained by cutting a conical surface by an arbitrary plane
• Cone (topology), in topology, coning may be applied to a topological space
• Mapping cone of a continuous map of topological spaces
• Cone (linear algebra), in linear algebra, a subset of vector space closed under positive scaling
  • Convex cone, a cone that is closed under convex combinations
• Cone graph, in graph theory, a graph with a universal vertex
• Central projection, also called "conical projection", in geometry; see also perspective projection
• In cartography, however, a conic (or conical) projection maps the spherical surface of the Earth to a conical surface, that is then unrolled onto a plane; see map projection
• Cone (category theory), a family of morphisms resembling a geometric cone.

Cone can also be a proper name or nickname:

• Cone, the nickname of Jason McCaslin, bassist for the Canadian band Sum 41
• Fairfax M. Cone, an American advertising executive

Mathematics. The surface generated by a straight line, the generator, passing through a fixed point, the vertex, and moving along a fixed curve, the directrix. A right circular cone.

[edit] See also

• KONE

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