В четырехугольнике ABCD диагонали AC и BD пересекаются в точке O.
SBOC = 20 см2
, SCOD = 40 см2
, SAOD = 60 см2
, AB = 12 см, OA = 10 см, ∠AOB > 31◦
.
Найдите ∠BAO.
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