Nice textbook! Great for home schoolers, too. Sections include: Common Sense and Exact Reasoning Sets, Real Numbers, and Lines Lines, Planes, and Separation Angles and Triangles Congruence A Closer Look at Proof Geometric Inequalities Perpendicular Lines and Planes in Space Parallel Lines in a Plane Parallel Lines and Planes Polygonal Regions and Their Areas Similarity Plane Coordinate Geometry Circles and Spheres Characterizations and Constructions Areas of Circles and Sectors Trigonometry Symmetry, Transformations, and Vectors Solids and Their Volumes Postulates and Theorems List of Symbols Index Selected Answers.