How do you  find exterior angles of a decagon?
<answer> To find the sum of the angles in a polygon, you use the formula n-2 multiplied by 180, where n is the number of sides the polygon has. <context> There are 1440 degrees in a decagon. To find the sum of the angles in a polygon, you use the formula n-2 multiplied by 180, where n is the number of sides the polygon has.