Projection in Descriptive Geometry

This lecture introduces the principles of Descriptive Geometry, focusing on points, lines, planes, intersections, parallelism, perpendicularity, shadows, and metric problems. It covers circle projections, spheres, cones, cylinders, and their tangent planes and sections. The course uses GeoGebra for defining, visualizing, and manipulating geometric objects. Weekly online classes and exercises are provided. The content includes the method of Monge, examples, and exercises on projections, shadows, and intersections. The lecture aims to provide a 2D representation of 3D spatial situations, emphasizing the resolution of geometric problems. It explores the intersection of planes with cones and the use of GeoGebra for visualizations.