The '''center''' of an object (in [[Geometry]]) is a point in some sense in the middle of the object. If geometry is regarded as the [[study]] of [http://en.wikipedia.org/wiki/Isometry_group isometry groups] then the centre is a fixed point of the isometries. | The '''center''' of an object (in [[Geometry]]) is a point in some sense in the middle of the object. If geometry is regarded as the [[study]] of [http://en.wikipedia.org/wiki/Isometry_group isometry groups] then the centre is a fixed point of the isometries. |