Explicație pas cu pas:
a) 14°21'50"+115°48'21"=129°69'71"=129°70'11"
=130°10'11"
b) 150°32'-71°40'=149°92'-71°40'=78°52'
c) 87°35':2=86°95':2=86°94'60":2=43°47'30"
