document.write( "Question 855202: A sphere has a surface area of 200 square centimeters. Which choice is the best approximation of its diameter? Use 3.14 to approximate pi. \n" ); document.write( "
Algebra.Com's Answer #515137 by Theo(13342)\"\" \"About 
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pi = 3.14
\n" ); document.write( "surface area = 200 square cm.
\n" ); document.write( "formula for surface area of a sphere is:
\n" ); document.write( "sa = 4*pi*r^2
\n" ); document.write( "replace variables with what you know to get:
\n" ); document.write( "200 = 4*3.16*r^2
\n" ); document.write( "simplify to get:
\n" ); document.write( "200 = 12.56*r^2
\n" ); document.write( "divide both sides of this equation by 12.56 to get
\n" ); document.write( "200/12.56 = r^2
\n" ); document.write( "simplify to get:
\n" ); document.write( "15.92356688 = r^2
\n" ); document.write( "take the square root of both sides of this equation to get:
\n" ); document.write( "3.990434422
\n" ); document.write( "since diameter is equal to 2 times the radius, you get:
\n" ); document.write( "d = 2*r = 7.980868845
\n" ); document.write( "your answer will be either:
\n" ); document.write( "8 or 8.0 or 7.98 or 7.981 or 7.9809
\n" ); document.write( "depending on how many decimal places the selection have been rounded to.
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