About: http://webisa.webdatacommons.org/296655368

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	9-12.3.b applying slope to verify and determine whether lines are parallel or perpendicular;
http://www.w3.org/ns/prov#wasQuotedFrom	ixl.com