About: http://webisa.webdatacommons.org/39904475

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	For our purposes, we will only deal with the simpler situations in which the object is a vertical line that has its bottom located upon the principal axis.
http://www.w3.org/ns/prov#wasQuotedFrom	physicsclassroom.com