After proving $\angle OMA = \angle OMB$ and noting they form a straight angle, each must be—

Question

Accepted Answer

a right angle

Answer

an acute angle

Answer

an obtuse angle

Answer

a reflex angle

After proving ∠OMA=∠OMB\angle OMA = \angle OMB∠OMA=∠OMB and noting they form a straight angle, each must be—