The One-seventh Area Triangle (Feynman's Triangle)
See also: [url]http://www.geogebratube.org/material/show/id/23848[/url]
Reference:
1. Alsina, C. & Nelsen, R. B. (2010). Charming Proofs: A Journey Into Elegant Mathematics. The Mathematical Association of America: USA.
2. Man, Y. K. (2009). On Feynman's Triangle problem and the Routh Theorem. Teaching Mathematics and its Applications, 28(1), 16-20.
