Prove that the exterior angle of a regular decagon is one-third the interior angle of a regular pentagon.

The missing angle is marked as $x$. If the value of $x$ is $k°$, then find $k$.

Find the angle measure of $x$ in the given figure:

Find the angle measure $x$ in each of the following figures.

From the below figure, find the value of $x$.

Find the angle measure $x$ in the given figure:

Find the angle measure $x$ in each of the following figures.