. . . "http://dbpedia.org/resource/Radius"^^ . . "r" . . . . . . . "http://www.iso.org/iso/catalogue_detail?csnumber=43012"^^ . "Radius"@en . . . . . . . . "http://en.wikipedia.org/wiki/Radius"^^ . . . . . . . . . . . . . . "In classical geometry, the \"Radius\" of a circle or sphere is any line segment from its center to its perimeter the radius of a circle or sphere is the length of any such segment." . . . "\\(r = \\frac{d}{2}\\), where \\(d\\) is the circle diameter."^^ . . . . . . . . .