Semicircular instrument (10)
I believe the answer is:
protractor
(Other definitions for protractor that I've seen before include "Geometrical instrument" , "draughtsman may use this" , "Angle-measuring device" , "muscle" , "Geometry set item" .)
I believe the answer is:
protractor
(Other definitions for protractor that I've seen before include "Geometrical instrument" , "draughtsman may use this" , "Angle-measuring device" , "muscle" , "Geometry set item" .)