document.write( "Question 69356: how do you calculate the surface area of a cone with height of 18 ft and r of 10 ft \n" ); document.write( "
Algebra.Com's Answer #67008 by zerosignal(28)\"\" \"About 
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Formula for area of a cone is \"pi%2Ar%2Asqrt%28r%5E2%2Bh%5E2%29\"\r
\n" ); document.write( "\n" ); document.write( "if h = 18 & r = 10 then:\r
\n" ); document.write( "\n" ); document.write( "\"a+=+pi%2A10%2Asqrt%2810%5E2%2B18%5E2%29\"
\n" ); document.write( "\"a+=+pi%2A10%2Asqrt%28100%2B324%29\"
\n" ); document.write( "\"a+=+pi%2A10%2Asqrt%28424%29\"
\n" ); document.write( "\"a+=+pi%2A10%2A%2820.59126028%29\"
\n" ); document.write( "\"a+=+646.8935203\"\"ft%5E2\"\r
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