The formula for calculating the sum of interior angles is \ ( (n - 2) \times 180^\circ\) where \ (n\) is the number of sides. All the interior angles in a regular polygon are equal.

Find the sum of interior angles of a 53-sided polygon. It would not be practical to draw a 53-sided polygon, so the formula is more useful here. (53 – 2) × 180 = 51 × 180 = 9180.