Sphere, Cone, and Cylinder: Descriptive Geometry

This lecture covers the definitions and properties of spheres, cones, and cylinders, including sections of a sphere, projections, and apparent contours. It also discusses intersections of lines with spheres, as well as cones and cylinders as ruled surfaces. Special cases such as circular cones and cylinders are explored, along with the intersection of a line with a cone. The lecture concludes with sections on conic sections, including ellipses, parabolas, and hyperbolas, and their asymptotes. Practical applications and examples are provided throughout the lecture.