document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=898316>Question 898316</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The total surface area of a sphere is given by A= 4&#960;r^2. Find r when the A = 616 cm^2 and &#960; = 22/7? </SPAN>\n" );
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document.write( "(1) A = 4*pi*r^2<BR>\n" );
document.write( "(2) A = 616 cm^2<BR>\n" );
document.write( "(3) pi = 22/7<BR>\n" );
document.write( "Place A and pi into (1) and get<BR>\n" );
document.write( "(4) 616 = 4*(22/7)*r^2<BR>\n" );
document.write( "Solve (4) for r^2 and get<BR>\n" );
document.write( "(5) r^2 = 616*7/(4*22) or<BR>\n" );
document.write( "(6) r^2 = 7*7 or<BR>\n" );
document.write( "(7) r = 7<BR>\n" );
document.write( "Use (1) to check the value of r.<BR>\n" );
document.write( "Is (616 = 4*(22/7)*7^2)?<BR>\n" );
document.write( "Is (616 = (88/7)*7*7)?<BR>\n" );
document.write( "Is (616 = 88*7)?<BR>\n" );
document.write( "Is 616 = 616)? Yes<BR>\n" );
document.write( "Answer; r = 7cm.<BR>\n" );
document.write( " </SPAN>\n" );
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