True Magnitude of Segments: Ellipses and Affinities

This lecture covers the concept of true magnitude of segments in descriptive geometry, focusing on the construction of ellipses and affinities. It explains the process of folding down planes to reveal true sizes, constructing segments in true size, and projecting circles using oblique affinities. The instructor demonstrates how to determine the true size of segments and ellipses through various examples and exercises. Additionally, the lecture explores the method of constructing shadows and projections in different planes, emphasizing the importance of accurate measurements and geometric transformations.