The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees.
1980 degrees.
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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.
180 degrees
1080 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