"In geometry, a centre (or center) (from Greek κέντρον) of an object is a point in some sense in the middle of the object. According to ...
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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 center is a fixed point of all the isometries which move the object onto itself." - (en.wikipedia.org 31.05.2021)