How much degrees does seven sided polygon have?

A seven-sided polygon, also known as a heptagon, has interior angles that sum up to 900 degrees. This is calculated using the formula for the sum of interior angles of a polygon, which is (n - 2) × 180, where n is the number of sides. For a heptagon, n is 7, so (7 - 2) × 180 = 900 degrees. Each interior angle of a regular heptagon would thus be 900 degrees divided by 7, approximately 128.57 degrees.