How many degrees is in a 5-sided polygon?

A 5-sided polygon, also known as a pentagon, has interior angles that sum up to 540 degrees. This is calculated using the formula for the sum of interior angles of a polygon, which is (n - 2) × 180 degrees, where n is the number of sides. For a pentagon, n = 5, so (5 - 2) × 180 = 540 degrees.