Lecture
This lecture covers the study of surfaces and curvature in geometry, focusing on surfaces with zero constant curvature, ruled surfaces, and surfaces between two circles. It also explores the development of surfaces, including quasi and non-developability, and the paradox of surfaces with negative curvature. The lecture delves into the Gaussian curvature of ruled surfaces, generalizations of conic sections, and hyperboloids of revolution. Practical applications such as structural elements like beams and vaulted configurations are also discussed, providing a comprehensive overview of the fundamental concepts in geometry.