Textbook in PDF format

From two authors who embrace technology in the classroom and value the role of collaborative learning comes College Geometry Using The Geometer's Sketchpad. The book's truly discovery-based approach guides readers to learn geometry through explorations of topics ranging from triangles and circles to transformational, taxicab, and hyperbolic geometries. In the process, readers hone their understanding of geometry and their ability to write rigorous mathematical proofs. Using The Geometer’s Sketchpad Constructing → Proving Mathematical Arguments and Triangle Geometry Circle Geometry and Proofs Analytic Geometry Taxicab Geometry Finite Geometries Transformational Geometry Isometries and Matrices Symmetry in the Plane Hyperbolic Geometry Projective Geometry Appendixes Trigonometry Calculating with Matrices