The 10 interior angles of a decagon add up to 1440 degrees
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The sum of the interior angles of a decagon is 1440 degrees The sum of the interior angles of a triangle is 180 degreesThe difference in the sum of the interior angles of a decagon compared to a triangle = 1440 degrees minus 180 degrees = 1260 degrees
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1440
Add each side of the decagon, or all ten sides, to get the sum.