a) 44⁰ 38' 15" + 29⁰ 46' 28" = 73⁰ 84' 43"=74⁰ 24' 43"
b) 66⁰ 58' 11" + 17⁰ 24' 43" = 83⁰ 82' 54"=84⁰ 22' 54"
c) 100⁰ 50' 42"-83⁰ 55' 28" =99⁰ 110' 42"-83⁰ 55' 28"=16⁰ 55' 14"
d) 108⁰ 12' 14" - 57⁰ 57' 16" = 107⁰ 72' 14" - 57⁰ 57' 16" =
=107⁰ 71' 74" - 57⁰ 57' 16" = 50⁰ 14' 58"
