document.write( "Question 303878: find the surface area of a sphere with a radius of 20 feet \n" ); document.write( "
Algebra.Com's Answer #217712 by london maths tutor(243)\"\" \"About 
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The surface area of a sphere = \"4%2Api%2Ar%5E2\" where r is radius\r
\n" ); document.write( "\n" ); document.write( "Surface area = \"4%2Api%2A%2820%5E2%29\"
\n" ); document.write( " = 5026.5 ft^2
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