document.write( "Question 423495: Find Area of a pentagon with radius 9cm \n" ); document.write( "
Algebra.Com's Answer #295362 by Alan3354(69443)\"\" \"About 
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Area = nR^2*sin(360/n)/2 for all regular polygons
\n" ); document.write( "= 5*81*sin(72)/2
\n" ); document.write( "= 202.5*sin(72)
\n" ); document.write( "=~ 192.5889 sq cm
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