Back Middelpunt Afrikaans مركز (هندسة رياضية) Arabic Centru (xeometría) AST কেন্দ্র (জ্যামিতি) Bengali/Bangla Centre (geometria) Catalan چەق (ئەندازە) CKB Centrum (geometri) Danish Mittelpunkt German Κέντρο (γεωμετρία) Greek Centro (matematiko) Esperanto
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circumference C
diameter D
radius R
centre or origin O
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. If geometry is regarded as the study of isometry groups, then a centre is a fixed point of all the isometries that move the object onto itself.