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Skoro ∡MAC = 30⁰, to:
∡BAC = 2 × 30⁰ = 60⁰
∡C = 42⁰
Suma kątów w trójkącie = 180⁰
∡B = 180⁰ - (60⁰ + 42⁰) = 180⁰ - 102⁰ = 78⁰
Odp. Kąt B ma miarę 78⁰.