"About the Author - Ron Larson received his Ph.D. in mathematics from the University of Colorado in 1970. At that time, he accepted a position with Penn State University in Erie, Pennsylvania, and currently holds the rank of professor of mathematics at the university. Ron is the lead author for over forty mathematics textbooks from 6th grade through calculus. Many of his texts, such as the 9th edition of his calculus text, are leaders in ..."
Math, Course 2 Worked Out Solution Key by Mcdougal Littel Paperback, 496 Pages, Published 2006 by Mcdougal Littel ISBN-13: 978-0-618-74115-1, ISBN: 0-618-74115-1
"Essentials of geometry -- Reasoning and proof -- Parallel and perpendicular lines -- Congruent triangles -- Relationships within triangles -- Similarity -- Right triangles and trigonometry -- Quadrilaterals -- Properties of transformations ..."