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Centre (geometry)
In geometry, a centre (or center) (from Greek ''κέντρον'') 〔http://en.wiktionary.org/wiki/center〕 of an object is a point in some sense in the middle of the object. According to the specific definition of center taken into consideration, an object might have no center. If geometry is regarded as the study of isometry groups then a centre is a fixed point of all the isometries which move the object onto itself.
==Circles, spheres, and segments==
The centre of a circle is the point equidistant from the points on the edge. Similarly the centre of a sphere is the point equidistant from the points on the surface, and the centre of a line segment is the midpoint of the two ends.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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