About: http://webisa.webdatacommons.org/57206086

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	Proving that a figure is a parallelogram if and only if opposite sides are congruent
http://www.w3.org/ns/prov#wasQuotedFrom	khanacademy.org