About: http://webisa.webdatacommons.org/147265399

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	Though mathematicians had been aware for many years that the ratio ?? between the circumference and the diameter of a circle was a constant, there were wide variations in the estimations of its magnitude.
http://www.w3.org/ns/prov#wasQuotedFrom	mpoweruk.com