8.1 Planar Curves and Arcs8.2 Space Curves and Arcs8.3 Surfaces and Solids8.3.3 Example: an ellipsoid8.3.4 Gauss ’ definition of surface curvature8.3.5 Principal, Gaussian, and mean surface curvature8.3.6 Volume8.3.7 Isothetic polyhedra8.4 Surface Tracing and Approximation8.5 Exercises8.6 Commented Bibliography