Other
Platonic Realms: Conics
This resource provides in depth information on the conic sections. Click on the underlined words for definitions and diagrams.
National Council of Teachers of Mathematics
The Math Forum: Parallel Lines and Conic Sections
Dr. Math and a couple of students discuss the possibility of whether parallel lines can be constructed as a degenerate case of conics.
National Council of Teachers of Mathematics
The Math Forum: Types of Degernate Conics
Dr. Math, in response to a student question, provides insight into degenerate cases of conic sections.