...pretty sure the sum will be one more than the original number.
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The sum of one odd number and one even number is another odd number.
The sum of any one number is just itself.
-- 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.
12
the sum of a number that is one less than three is two