Find the angle and its bisector from the given figure below.

An angle is formed when two rays share a common endpoint. An angle bisector is a line segment or a ray that divides the angle into two angles that are congruent or equal in measure.

OB is the bisector that divides the $\angle \mathrm{AOC}$ into two equal angles$\angle \mathrm{COB} \mathrm{and} \angle \mathrm{BOA}$.

As$\angle \mathrm{COA}={70}^0$,$\angle \mathrm{COB}={35}^0 \mathrm{and} \angle \mathrm{BOA}={35}^0$.

Therefore, $\angle \mathrm{AOC}$ is the angle and OB is its bisector.