Circumference
Circumference was the surrounding of the inner point of an object. It was an important part of geometry and used to calculate a radius.
The hypergiant star Captain Jonathan Archer and the Vissian Drennik observed from aboard the stratopod had a circumference of nearly a billion kilometers. (ENT: "Cogenitor")
The planet Miri was a spheroid body with a circumference of 24,874 miles. (TOS: "Miri")
In 2371, Harry Kim scanned Avery III and identified the force field having a circumference with more than six-hundred kilometers. (VOY: "Faces")
Valen identified the Void as an anomaly with approximately nine light years in circumference. (VOY: "The Void")