Question 1173718
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Decagon has 10 sides.


The sum of the interior angles of any convex polygon is  (n-2)*180  degrees, where n is the number of sides.



THEREFORE, for the regular decagon, the sum of its interior angles is  

    {{{(10-2)*180}}} degrees = 8*180 degrees = 1440 degrees.



Hence, each individual interior angle is  1400/10 = 144  degrees.    <U>ANSWER</U>
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Solved.