Angles in a Pentagon

Consider a polygon with 5 sides, known as a pentagon. If one of the interior angles of the pentagon measures $120^{ ext{o}}$, what is the measure of one of the other interior angles, given that the other four angles are equal?

Recall that the sum of the interior angles of a polygon can be calculated using the formula:

$$ S = (n-2) \times 180^{\circ} $$

where $n$ is the number of sides of the polygon.