About: http://webisa.webdatacommons.org/161846101

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	A common tangent to two circles is a straight line that touches the two circles respectively at one point only
http://www.w3.org/ns/prov#wasQuotedFrom	blogspot.com