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Kąt CBO = 180 - 42 = 138
Kąt BOC = (180 - 138) / 2 = 42/2=21
Kąt AOB = 180 - (42 + 42) = 180 - 84 = 96
β = 180 - (96 + 21) = 180 - 117 = 63
Odp. B