<i>Spherical Trigonometry: For the Use of Colleges and Schools – with Numerous Examples</i>, is the work of Isaac Todhunter, an honorary fellow of St. John's College.<br><br>At less than two hundred pages, <i>Spherical Trigonometry</i> a brief work by the standards of most textbooks. Todhunter has focused his book on a fairly narrow topic, and as such the subject is explored with a good deal of detail. The book begins with an introduction of great and small circles and the applicable mathematical principles. The book proceeds to explore spherical geometry, spherical triangles, geodetical operations, polyhedrons, and miscellaneous propositions, and many more. While examples are presented throughout, the book does not offer the reader with practice questions and answers, as most textbooks do.<br><br><i>Spherical Trigonometry</i> is a well written textbook that presents its subject matter in detail. Suitable for high school or college students, the material covered is of a moderate difficulty level, but could serve as an individual's introduction to trigonometry. The lack of practice question is somewhat of a disappointment, but the book does provide ample examples with detailed solutions.<br><br>If you are in the market for a basic trigonometry textbook, <i>Spherical Trigonometry: For the Use of Colleges and Schools – with Numerous Examples</i> is worthy of your consideration. Todhunter presents the subject matter concisely, and the book would be appropriate for use by either a student or a teacher.