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β - 40⁰ - miara danego kąta
β + (β - 40⁰) = 180⁰
2 β = 180⁰ +40⁰ = 220⁰
β = 110⁰
β - 40⁰ = 110⁰ - 40⁰ = 70 ⁰
Odp.Kąty mają miary 70⁰ oraz 110⁰.