a)180 grade - 45 grade = 135 grade
b)180 grade - 137 grade =43 grade
c)180 grade= 179 grade 60'
179 grade 60' - 110 grade 20'=69 grade 40'
d)180 grade= 179 grade 59' 60''
179 grade 59' 60'' - 65 grade 3' 29''=114 grade 56' 31''
e)180 grade= 179 grade 59' 60''
179 grade 59' 60'' - 134 grade 59' 3''= 45 grade 57''