Radius is the distance from the center of a circle to the outside edge. The relationship between the radius and the circumference of a circle is . Starships often scanned within a given radius when making an analysis or evaluation of nearby space. In the alternate timeline created by the Na'kuhl, Nazis searched for Captain Archer within a fifteen-mile radius. (ENT: "Storm Front") After failing to obtain a transporter lock on the away team on a planet created by Trelane, Spock beamed aboard all lifeforms within a predetermined radius. (TOS: "The Squire of Gothos" )