Cos a= (b²+c²-a²) / 2bc=(7²+33²-37²)/ 2*33*7
cosa=-1/2=-0.5
cosa=120°
Ответ: В=120°
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Cos a= (b²+c²-a²) / 2bc=(7²+33²-37²)/ 2*33*7
cosa=-1/2=-0.5
cosa=120°
Ответ: В=120°