A dodecagon is a polygon with twelve sides and twelve angles. The name comes from the Greek words "dodeca," meaning twelve, and "gon," meaning angle. Dodecagons can be regular, where all sides and angles are equal, or irregular, where they vary in length and angle. They are often seen in architecture and design, adding unique shapes to buildings and art. In geometry, the sum of the interior angles of a dodecagon is 1800 degrees. This is calculated using the formula (n-2) × 180, where n is the number of sides. Dodecagons can also be found in nature, such as in certain crystals and patterns, showcasing the beauty of geometry in the world around us.