About: http://webisa.webdatacommons.org/416734340

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	You didn't say so but I assume that the cross section of your tube is a circle.
http://www.w3.org/ns/prov#wasQuotedFrom	uregina.ca