About: http://webisa.webdatacommons.org/205950180

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	Optimally, angle A is 90 degrees (modulo 180 degrees), i.e. (90+n???180) degrees, where n is an integer or zero, although other angles are permissible.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com