The vertex from the given angle is .

If $ABC$ is a straight line then value of $x$, in the given diagram will be 

Find the angle which is five times its supplement.

Find the measure of an angle which is equal to its complement.

The number of planes passing through $3$ non-collinear points are

Find the measure of an angle which $30°$ less than its supplement.

Find the angle which is four times its complement.

In the given figure, $\mathrm{\Delta ODC}~\mathrm{\Delta OBA}, \angle \mathrm{BOC}=115°$ and $\angle \mathrm{CDO}=70°$.
Find $\angle DOC$.

How many lines can be drawn to pass through a given point?

Define the following term: Line segment