About: http://webisa.webdatacommons.org/441791865

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	First, a note: your question is a special case of a Medial Triangle where the outer triangle is specified to be right.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com