Răspuns :
Ex 3:
a) <) AOB = 17*38'
Complementul : 90* -17*38' = 89*60' =
= 72*22'
Suplementul : 179*60' - 17*38' = 162*22'
b) 1) 89*60' - 83*59' = 6*1'
2) 179*60' - 83*59' = 96*1'
c) 89*60'59" - 48*15'45" = 41*44'15"
179*60'59" -48*15'45" = 131*44"15"
* grade.