From the Back Cover
Get un–stumped in a hurry! Proofs made easier Make friends with lines and angles, theorems and postulates — and prove it The proof is in the pudding — and the parallelogram, and sometimes the rhombus. With this friendly guide, you′ll soon be devouring proofs with relish. You′ll find out how a proof′s chain of logic works and discover some basic secrets for getting past rough spots. Before you know it, you′ll be proving triangles congruent, calculating circumference, using formulas, and serving up pi. Discover how to: Identify lines, angles, and planes Calculate the area of a triangle Figure the volume and surface area of a pyramid Bisect angles and construct perpendicular lines Work with 3D shapes
About the Author
A graduate of Brown University and the University of Wisconsin Law School, Mark Ryan has been teaching math since 1989. He runs The Math Center (www.themathcenter.com) in Winnetka, Illinois, where he teaches high school math courses, including an introduction to geometry and a workshop for parents based on a program he developed, The 10 Habits of Highly Successful Math Students. In high school, he twice scored a perfect 800 on the math portion of the SAT, and he not only knows mathematics, he has a gift for explaining it in plain English. He practiced law for four years before deciding he should do something he enjoys and use his natural talent for mathematics. Ryan is a member of the Authors Guild and the National Council of Teachers of Mathematics. Geometry For Dummies, 2nd Edition, is Ryan’s fifth book. Everyday Math for Everyday Life (Grand Central Publishing) was published in 2002; Calculus For Dummies (Wiley), in 2003; Calculus Workbook For Dummies (Wiley), in 2005; and Geometry Workbook For Dummies (Wiley), in 2006. His math books have sold over 200,000 copies.