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In geometry, a centre (British English) or center (American English) (from Ancient Greek κέντρον (kéntron) 'pointy object') of an object is a point in some sense in the middle of the object. According to the specific definition of centre taken into consideration, an object might have no centre.
The term is peculiar to the English language; French, for instance, uses "centre de gravité" on most occasions, and other languages use terms of similar meaning. [citation needed] The center of gravity, as the name indicates, is a notion that arose in mechanics, most likely in connection with building activities.
Center (HTML element), coded with <center></center> Centre Academy East Anglia, an independent special school in Brettenham, Suffolk, England; Centre College, a liberal arts college in Danville, Kentucky, United States; Centre Radio, a former British radio station; Centers (Fourth Way), in G.I. Gurdjieff's Fourth Way teaching
The center of mass of a body with an axis of symmetry and constant density must lie on this axis. Thus, the center of mass of a circular cylinder of constant density has its center of mass on the axis of the cylinder. In the same way, the center of mass of a spherically symmetric body of constant density is at the center of the sphere.
In geometry, a triangle center or triangle centre is a point in the triangle's plane that is in some sense in the middle of the triangle. For example, the centroid , circumcenter , incenter and orthocenter were familiar to the ancient Greeks , and can be obtained by simple constructions .
center Or centre. The four squares in the middle of the board. [72] See also expanded center. Sometimes short for pawn center. A king "in the center" can refer to an uncastled king on a center file. center file Or centre file. The king's file (e-file) or queen's file (d-file). center pawn Or centre pawn.
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The center of a group G consists of all those elements x in G such that xg = gx for all g in G. This is a normal subgroup of G. The similarly named notion for a semigroup is defined likewise and it is a subsemigroup. [1] [2] The center of a ring (or an associative algebra) R is the subset of R consisting of all those elements x of R such that ...