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The sum of the interior angles of a simple n-gon is (n − 2)180 degrees. So a ten sided polygon will have a total of (10-2)180 degrees, or 8 x 180, or 1440 degrees. If 9 of those total 1290 then the 10th must measure 1440 - 1290 = 150 degrees.

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Q: If the sum of the measure of 9 angles of a polygon with 10 sides is 1290 what is the measure of the tenth angle?
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