About: http://webisa.webdatacommons.org/181411207

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	Or, there is a contained angle between the first side edge and the second side edge, and make the protruding key look like a trapezoid (not illustrated) from a top view.
http://www.w3.org/ns/prov#wasQuotedFrom	google.com