the famous "1/7" triangle
[url]http://www.futilitycloset.com/category/science-math/page/2/[/url]
[url]http://mathafou.free.fr/pbw_en/pb420.html[/url]
[url]http://www.cut-the-knot.org/ctk/FromLCarrollToArchimedes.shtml[/url]
a simple proof based on the ratio of the areas of two triangles (in case of equal altitudes)
Thessaloniki (Macedonia-Greece)
March 2014
