16,
$→\widehat{BOC}=\widehat{BOD}+\widehat{DOC}=30^\circ+46^\circ=76^\circ$
17,
Ta có: $\widehat{xOy}+\widehat{yOz}=180^\circ$
$→\widehat{yOz}=180^\circ-50^\circ=130^\circ$
Mà: $Ot$ là tia phân giác $\widehat{yOz}$
$→\widehat{yOt}=\widehat{tOz}=\dfrac{130^\circ}{2}=65^\circ$
$→\widehat{tOx}=\widehat{tOy}+\widehat{yOx}=65^\circ+50^\circ=115^\circ$
