For a Regular Shape (all angles measure the same), you can split it up into triangles to find the total angle measures. For example, in a square, you can only split it in half, making 2 triangles...
In total the interior angles add to (8-2)*180 = 6*180 = 1080 degrees.IF the octagon is regular, so that all of its angles are equal, then each one is 1080/8 = 135 degrees.
The sum of angles in degree = 180(n - 2), where n is the number of sides of the regular polygon.The sum of angles in degree = 180(n - 2); n = 8 The sum of angles in degree = 180(8 - 2) = 180(6) =...