Interior angles of a 15-gon

The interior angles of a polygon can be calculated using the formula ((n - 2) \times 180^\circ), where (n) is the number of sides. For a 15-gon, this would be ((15 - 2) \times 180^\circ = 13 \times 180^\circ = 2340^\circ). Therefore, the sum of the interior angles of a 15-gon is 2340 degrees. Each individual interior angle, if the polygon is regular, would be (2340^\circ / 15 = 156^\circ).