Acquaint your 11th graders with the fundamental tools of geometry! Impressing on students the necessity of a formal proof before plunging into demonstrative geometry, this exercise-filled textbook covers rectilinear figures, proportions, circles, solutions of right triangles, and more. 'Extras' include mathematical information on famous buildings, biographies of mathematicians, and geometry in the world around us. Approx. 330 pages, softcover.