No, all of them are not of equal length. The three shorter sides are all of the equal lengths, so all their angles are also of equal length, which means they   A polygon is a shape with n sides. The sum of the interior angles of a polygon is 180(n - 2., where n is the number of sides. The interior angles of regular hexagons add up to a sum of 720 degrees. Each of the interior angles of a regular hexagon has a measure of 120 degrees.