Identify a nonagon from the following

What is the sum of all interior angles of a regular pentagon?

For a convex polygon of $n$ sides, find the um of all exterior angles and the sum of all interior angles.

Find the number of sides of a regular polygon whose each exterior angle measure: $40°$

A quadrilateral has _____ sides.

For a convex polygon of $n$ sides, find the um of all exterior angles, the sum of all interior angles and the number of diagonals.

In the given figure, find the angle measure $x$.

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

Is it possible to have a regular polygon each of whose interior angles is $100°$?

Is it possible to have a regular polygon each of whose exterior angles is $50°$?