document.write( "Question 1190832: the number of diagonals d of a polygon of n sides is given by d = n/2 (n-3). How many sides does a polygon with 77 diagonals have? \n" ); document.write( "
Algebra.Com's Answer #822561 by Alan3354(69443)\"\" \"About 
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the number of diagonals d of a polygon of n sides is given by d = n/2 (n-3). How many sides does a polygon with 77 diagonals have?
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\n" ); document.write( "(n/2)*(n-3) = 77
\n" ); document.write( "n^2 - 3n = 154
\n" ); document.write( "n^2 - 3n - 154 = 0
\n" ); document.write( "(n-14)*(n+11) = 0
\n" ); document.write( "n = 14 sides (Ignore the -11)\r
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