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Here is the formula-

(Number of sides -2) x180 degrees = angle sum.

The sum of the interior angles inside of a polygon will be 180*(n-2) degrees, where n=number of sides of the polygon. Example: a triangle has 3 sides; therefore, the sum of the angles inside will be equal to 180*(3-2)=180*(1)=180 degrees.

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Q: What is the sum of all of the angles inside a polygon?
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