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The sum of the interior angles of any regular polygon of n sides is equal to 180(n - 2) degrees. In this instance, the sum of the interior angles of a decagon is equal to 180 x (10 - 2) = 1440 degrees.
(10-2)*180 = 8*180 = 1440 degrees.

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Q: What is the sum of the interior angles of a decagon?
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