'This book is not written in the manner of a typical textbook. (Indeed, it is not really designed to serve as a textbook at all, though it could certainly be used as one with highly motivated students.) That is, we do not present full developments of key theorems up front, leaving only routine exercises for the reader to consider. For one, we leave strategic gaps in the exposition for the reader to fill in. For another, we include a number of nonroutine problems, of the sort found on the IMO or related national competitions. The reader may or may not succeed in solving these, but attempting them should provide a solid test of one’s understanding. In any case, solutions to the exercises and problems are included in the back; we have kept these brief, and they are only intended to make sense once you have already thought a bit about the corresponding exercises/problems on your own.'
'Aside from this introduction, the book is divided into four parts. The first part, “Rudiments”, is devoted to the foundations of Euclidean geometry and to some of the most pervasive ideas within the subject. The second part, “Special situations”, treats some common environments of classical synthetic geometry; it is here where one encounters many of the challenging Olympiad problems which helped inspire this book. The third part, “The roads to modern geometry”, consists of two4 chapters which treat slightly more advanced topics (inversive and projective geometry). The fourth part, “Odds and ends”, is the back matter of the book, to be consulted as the need arises; it includes hints for the exercises and problems (for more on the difference, see below), plus bibliographic references, suggestions for further reading, information about the open source license, and an index.'
