to find the sum of an interior angle...
FOR EXAMPLE: if you had a triangle, the total amount of degrees would be 180 degrees. now you must divide that from the number of sides...
180 divided by 3 = 60 so 1 interior angle would be 60 degrees
therefore, one EXTERIOR angle would be 120 degrees because 60 + 120 = 180 degrees or a straight line
hope this helps
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There is no single formulaImproved Answer:-(number of sides -2)*180 = number of the sum of interior angles
The sum of the interior angles is 360.
180*2
(number of sides - 2)*180 = sum of interior angles
It is: (number of sides -2)*180 = sum of interior angles If its a regular polygon then: sum of interior angles/number of sides = each interior angle