ABSTRACT This supplementary addendum methodologically validates the original formula (R2 = R1 - a), previously introduced by the author across 18 distinct geometric scenarios in "A Story of the Ellipse: Chapter 3," through a reduced right-triangle model derived from the ellipse's quadrant symmetry. As an alternative to conventional literature that generates calculation and rounding errors due to continuous decimal values, this method relies strictly on the internal dynamic values of the ellipse, offering precise calculations with a zero-error margin. Author’s Note on Methodology The theoretical foundation of this work is based exclusively on the Mathematics and Geometry curriculum and textbooks for Classical High Schools published by the Republic of Turkey Ministry of National Education (T.C.M.E.B.) between 1950 and 1960. All subsequent formulations, geometric-perceptual approaches, and the "Universal Method" presented herein have been developed independently by the author through 61 years of mental synthesis, architectural practice, and field applications, without reliance on any other external academic sources or modern literature.
Erkan Gürkan (Fri,) studied this question.