In the given figure, $AOB$ is a straight line. Find the value of $X$ and also answer $\angle BOP ?$

In the given figure, $AOB$ is a straight line. Find the value of $X$ and also answer 

which angle is obtuse?

In the given figure,$AOB$ is a straight line. Find the value of $X$ and also answer 

which angle is acute?

In the given figure, $PQR$ is a straight line. Find$X.$ Then complete the $\angle AQB ?$

In the given figure, $PQR$ is a straight line. Find $X.$ Then complete the $\angle BQP?$

In the given figure,$PQR$ is a straight line. Find$X.$ Then complete the$\angle AQR?$

In the given figure, lines $AB$ and $CD$ intersect at point $O.$Find the value of $\angle a ?$

In the given figure, lines $AB$ and $CD$ intersect at point$O.$ Name all the pairs of vertically opposite angles$?$

In the given figure, lines $AB$ and $CD$intersect at point $O.$ Name all the pairs of adjacent angles$?$