This textbook defines and analyzes important classes of transformations of the plane, specifically isometries and similarities, and integrates transformations with the traditional geometry of lines, triangles, and circles. The second half of the book introduces Felix Klein's Erlanger program, uses the transformational approach to establish traditional theorems of plane geometry, and describes rosette groups, frieze groups, and wallpapers groups Annotation ©2008 Book News, Inc., Portland, OR (booknews.com)