Some novel cyclic quadrilateral proofs
De Villiers, Michael,Learning and Teaching Mathematics, 2007, 3 (2007),
publicationName = "Association for Mathematics Education of South Africa (AMESA)",
issn = "1990-6811",
abstract= "Recently in the geometry courses I am teaching at Kennesaw State University, a circle geometry result not so well-known in the USA was posed as a problem, namely, to prove that the opposite angles of a (convex) cyclic quadrilateral are supplementary. One of the students, Matt Hickman, came up with the following proof I had not yet seen before, which readers may find interesting."
language="English",
type="Journal Article"