About: http://webisa.webdatacommons.org/422927119

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 right angle is an angle whose measure is exactly 90 degrees, like the angles of the square.
http://www.w3.org/ns/prov#wasQuotedFrom	ipadio.com