diameter of a circle

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• Circle of confusion — For the closely related topic in microscopy, see Point spread function. In optics, a circle of confusion is an optical spot caused by a cone of light rays from a lens not coming to a perfect focus when imaging a point source. It is also known as… …   Wikipedia

• Circle — This article is about the shape and mathematical concept. For other uses, see Circle (disambiguation). Circle illustration showing a radius, a diameter, the centre and the circumference …   Wikipedia

• Diameter — For the notion of diameter in graph theory, see Distance (graph theory). For the computer network protocol, see Diameter (protocol). Diameter In geometry, a diameter of a circle is any straight line segment that passes through the center of the… …   Wikipedia

• diameter — di|am|e|ter [daıˈæmıtə US ər] n [Date: 1300 1400; : Old French; Origin: diametre, from Greek diametros measure across , from metron measure ] a straight line from one side of a circle to the other side, passing through the centre of the circle,… …   Dictionary of contemporary English

• diameter — noun (C) a straight line going from one side of a circle to the other side, passing through the centre of the circle: 3 inches/1 metre etc in diameter: Draw a circle six centimetres in diameter …   Longman dictionary of contemporary English

• circle — {{Roman}}I.{{/Roman}} noun 1 shape ADJECTIVE ▪ complete, full ▪ The stones form a complete circle. ▪ How long does it take for the dial to rotate through a full circle? ▪ concentric …   Collocations dictionary

• Circle of forces — The circle of forces, traction circle, friction circle,[1] or friction ellipse[2][3][4] is a useful way to think about the dynamic interaction between a vehicle s tire and the road surface. In the diagram below we are looking at the tire from… …   Wikipedia

• circle of least confusion — physics : the minimum cross section of a symmetrical bundle of rays that have no common focus because of spherical aberration * * * Optics. the smallest cross section in a beam of paraxial rays, lying in the plane of least spherical aberration.… …   Useful english dictionary

• Circle rules football — Highest governing body Circle Rules Federation Nickname(s) Circle rules, CRF First played 2006, New York, New York Characteristics Contact Contact Team members …   Wikipedia

• diameter — [dī am′ət ər] n. [ME & OFr diametre < ML diametra < L diametrus < Gr diametros < dia , through + metron, a measure: see METER1] 1. a line segment passing through the center of a circle, sphere, etc. from one side to the other: see… …   English World dictionary

• Diameter — Di*am e*ter, n. [F. diam[ e]tre, L. diametros, fr. Gr. ?; dia through + ? measure. See {Meter}.] 1. (Geom.) (a) Any right line passing through the center of a figure or body, as a circle, conic section, sphere, cube, etc., and terminated by the… …   The Collaborative International Dictionary of English