<P><B></B> This book gives readers a comprehensive look at the most important concepts in the mathematics taught in grades 9-12. <B></B> Real numbers, functions, congruence, similarity, area and volume, trigonometry and more. <B></B> For high school mathematics teachers, mathematics supervisors, mathematics coordinators, mathematicians, and users of the University of Chicago School Mathematics Project materials for grades 7-12 who want a comprehensive reference book to use throughout their careers or anyone who wants a better understanding of mathematics. </P>