In a quadrilateral ABCD, if AO and BO be the bisectors of ∠A and ∠B respectively and, ∠C = 90° ∠D = 10°, then ∠AOB is:

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In a quadrilateral ABCD, if AO and BO be the bisectors of ∠A and ∠B respectively <>and, ∠C<> =<> 90° ∠D<> =<> 10°<>, then ∠AOB<> is: