About: http://webisa.webdatacommons.org/98736468

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	This solution seems overly complicated to me, especially since all one needs is the basic fact about side-lengths of a 30-60-90 triangle and the ability to recognize symmetry. (Virtually) No algebra needed.
http://www.w3.org/ns/prov#wasQuotedFrom	stackexchange.com