Respuesta :

calculista
the correct question is
Ray bd is the angle bisector of angle abc. m∠abc is 168° what is the measure of ∠dbc?

we know that
if bd is the angle bisector of angle abc
then 
m∠abd= m∠dbc
and
m∠abd=(1/2) m ∠ abc
m∠abd=(1/2)*(168°)-------> m∠abd=84°

therefore
m∠dbc=84°

see the picture attached to better understand the problem

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