This revised edition of a mathematical text originally published in 1957 investigates one of the simplest of mathematical figures, the circle. It deals with the... » 

This revised edition of a mathematical text originally published in 1957 investigates one of the simplest of mathematical figures, the circle. It deals with the representation of a circle by a point in three-space, a model for non-Euclidean geometry, and the isoperimetric property of the circle. «