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Răspuns :

Fie a, b, c - unghiurile
a/3 = b/5 = c/7
a+b+c = 180°
a - ?
Re/re:
a/3 = b/5 = c/7 = (a+b+c)/(3+5+7) = 180/15 = 12

a/3 = 12 => a = 12×3 = 36°