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This lecture covers the characteristics of quadratic surfaces in 3D space, such as hyperboloids and hyperbolic paraboloids, which are defined by equations involving three variables. The lecture explains how to formulate the Cartesian equations for these surfaces and highlights their similarities with quadratic curves in the plane. It also discusses the standard parameters used to represent these surfaces and emphasizes the importance of choosing the correct reference frame. The instructor demonstrates how to reformulate the Cartesian equations using standard conic parameters, providing a comprehensive understanding of the geometric properties of these surfaces.