It depends very much on what "it" is.
However, if "it" happens to be a polygon, the sum of the interior angles is (n-2)*180 degrees -or- (n-2)*Pi radians where "n" is the amount of sides of the polygon.
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-- Measure, calculate, or somehow get the measure of each interior angle. -- Add them all up to get one number which is their sum. -- That one number is the sum of the interior angles.
1080 degrees
180 degrees
Their sum is 360 and the angles in opposite corners are congruent.
If you mean the sum of its interior angles then it is 4140 degrees