About: http://webisa.webdatacommons.org/76698347

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	(the angle between the zero vector and any other vector is defined to be a right angle).
http://www.w3.org/ns/prov#wasQuotedFrom	wikibooks.org