derivative work of the following images: Image:Huygens + Snell + van Ceulen - regular polygon doubling.png licensed with Cc-by-sa-2.5,2.0,1.0, GFDL 2006-12-28T09:23:54Z...
inferior. File:Huygens + Snell + van Ceulen - regular polygon doubling.png → File:Huygens + Snell + van Ceulen - regular polygon doubling.svg For more information...
