Offers an introduction to the principles of geometry, from lines and angles to polygons, proofs, and coordinates.

Previous ed. by Wendy Arnone was published: New York, NY : Hungry Minds : Wiley Pub., c2001. A "Portable ed." was published: Hoboken, NJ : Wiley Pub., c2006. Hungry Minds (New York, NY) was acquired by Wiley Pub. (New York, NY) in 2001; Wiley Pub. relocated to Hoboken, NJ in 2002--Wiley website. Includes index.

Getting started with geometry basics. Introducing geometry ; Building your geometric foundation ; Sizing up segments and analyzing angles -- Introducing proofs. Prelude to proofs ; Your starter kit of easy theorems and short proofs ; The ultimate guide to tackling a longer proof -- Triangles : polygons of the three-sided variety. Grasping triangle fundamentals ; Regarding right triangles ; Completing congruent triangle proofs -- Polygons of the four-or-more sided variety. The seven wonders of the quadrilateral world ; Proving that you've got a particular quadrilateral ; Polygon formulas : area, angles, and diagonals ; Similarity : same shape, different size -- Working with not-so-vicious circles. Coming around to circle basics ; Circle formulas and theorems -- Going deep with 3-D geometry. 3-D space : proofs in a higher plane of existence ; Getting a grip on solid geometry -- Placement, points, and pictures : alternative geometry topics. Coordinate geometry ; Changing the scene with geometric transformations ; Locating loci and constructing constructions -- The part of tens. Ten things to use as reasons in geometry proofs ; Ten cool geometry problems - -Appendixes. A, Formulas and other important stuff you should know ; B, Glossary.