A shape that has seven sides is a heptagon. Heptagons can be either irregular or regular polygons. However, in a regular heptagon, all side lengths and interior angles are also equal. There also are 14 diagonals in this polygon.
While all interior angles in a regular heptagon are equal to approximately 128.6 degrees, the exterior angles are equal to 51.4 degrees. The sum of its interior angles is 900 degrees. The formula to find the sum of interior angles of a polygon is 180 (n-2) degrees, where n represents the number of sides of a polygon.
The area of a regular heptagon can be approximated with the formula: Area = 3.633 multiplied by s^2, where s^2 represents the side length squared.