the answer is either a marthon or cross country.
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Circumference.
Circumference
It is the name given to the straight line from the centre of a circle to its circumference when that distance is 18 mm.
The name given to a set of coordinates is "coordinate system".
First names and middle names are all given at the same time, when a name is chosen for a new baby, so they would all be considered given names, as compared to the family name which is inherited rather than given.