(A diagram would be used to show what the external angles are)For any regular shape the external angles add up to 360 degrees. The external angles will all be equal since we are dealing with a regular shape. And therefore, because there are six of them we do 360 divided by 6 to give us 60 degrees. As an extension we can use this to find out what the interior angles are. The angles on a straight line add up to 180 degrees. So, each of the interior angles will be 180-60 giving 120 degrees.