Question

Answer the following questions in relation to the figure in Q.4.

(2) Write the measure of the angle vertically opposite to ∠BOC.

Answer 1

A pair of non-adjacent angles formed by the intersection of two straight lines is known as a pair of vertically opposite angles.
The angle vertically opposite to $\angle BOC$ is $\angle DOA$.
m$\angle DOA$ = 120° (As found in the previous question)