Instance of: http://www.w3.org/2004/02/skos/core#Concept
Subject Field Subject Field/36
Is Reference of Flat angle-en#Sense
Angle rectiligne-fr#Sense
Gestreckter Winkel-de#Sense
Angolo piatto-it#Sense
Angolo a 180°-it#Sense
Gestrekte hoek-nl#Sense
Straight angle-en#Sense