About: http://webisa.webdatacommons.org/121112474

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	It has the quartic Cartesian equation (x2 + y2 - 2rx)2 = k2(x2 + y2) where r is the radius of the rolling circle or the rolled circle and k is a constant.
http://www.w3.org/ns/prov#wasQuotedFrom	daviddarling.info