Răspuns:
Explicație pas cu pas:
1) a) 82°45' + 29°38' = 111°83' = 112°23'
b) 64°18' - 15°49' = 63°78' - 15°49' = 48°29'
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2) ∡O = 15°27'
a) 4·∡O = 4· 15°27' = 60°108' = 61°48'
b) ∡O : 3 = 15°27' :3 = 5°9'
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3) ∡EDF = 43°24'
∡EDF : 7 = 43°24' : 7 = (42°+1°+24'):7 =
= 42°84':7 = 6°12'
