Field of angles (4)
I believe the answer is:
trig
(Other definitions for trig that I've seen before include "Neat" , "tight" , "Maths subject (informal)" , "Sound" , "branch of maths" .)
I believe the answer is:
trig
(Other definitions for trig that I've seen before include "Neat" , "tight" , "Maths subject (informal)" , "Sound" , "branch of maths" .)