The familiar plane geometry of high school - figures composed of lines and circles - takes on a new life when viewed as the study of properties that are preserved by special groups of transformations. No longer is there a single, universal geometry: different sets of transformations of the plane correspond to intriguing, disparate geometries. This book is the concluding Part IV of Geometric Transformations, but it can be studied independently of Parts I, II, and III, which appeared in this series as Volumes 8, 21, and 24. Part I treats the geometry of rigid motions of the plane (isometries); Part II treats the geometry of shape-preserving transformations of the plane (similarities); Part III treats the geometry of transformations of the plane that map lines to lines (affine and projective transformations) and introduces the Klein model of non-Euclidean geometry. The present Part IV develops the geometry of transformations of the plane that map circles to circles (conformal or anallagmatic geometry). The notion of inversion, or reflection in a circle, is the key tool employed. Applications include ruler-and-compass constructions and the Poincaré model of hyperbolic geometry. The straightforward, direct presentation assumes only some background in high-school geometry and trigonometry. Numerous exercises lead the reader to a mastery of the methods and concepts. The second half of the book contains detailed solutions of all the problems.

Yaglom’s Geometric Transformations is an impressive multi-volume work. Assuming a truly minimum background of basic high school geometry, Yaglom takes his readers on an inspired tour through the group-theoretic, transformational approach to geometry: its philosophy, its list of basic types of transformations, and its use in solving a large collection of interesting and challenging problems of plane geometry. It is a pleasure to now have the fourth and final volume of this series available for English readers. Geometric Transformations is a classic of its genre and belongs on the bookshelf of anyone with an interest in the transformational approach to geometry.

William Barker Source: MAA Reviews