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It is part of a curve. If that curve happens to be a circle, then it is a fraction of a circumference but it need not be.
An arc
It is: 15/360 = 1/24 of a circle's circumference
An arc is a fraction of its circumference
The Circumference of a circle is twice the Radius x Pi (π) OR C = π x 2R ... (2 x Radius) x Pi (π) = Circumference The value of π is taken to be 3.142