document.write( "Question 405814: The sum of the interior angle measures of a convex polygon is 1980 degrees . How many sides does it have? \n" ); document.write( "
Algebra.Com's Answer #286555 by Alan3354(69443)\"\" \"About 
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Sum = 180*(n-2) = 1980
\n" ); document.write( "n-2 = 11
\n" ); document.write( "n = 13
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