document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=5372>Question 5372</A>: <I><SPAN STYLE=\"word-break: break-all;\"> I'm sorry, I need help again.\r<BR>\n" );
document.write( "\n" );
document.write( "What is the radius of a circle whose area is 154 square centimeters?<BR>\n" );
document.write( "A=pi r(squared) for pi they are using 22/7 if I am right that is 3.14?<BR>\n" );
document.write( "154=3.14 r(squared)<BR>\n" );
document.write( "This is as far as I can get because I can not remember how to do the squared.<BR>\n" );
document.write( "After this I am going to bed. My brain is fried trying to fiqure all these out and trying to explain them to him in the process. </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #2722 by </B><A HREF=/tutors/aboutme.mpl?userid=rapaljer><B>rapaljer(4671)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=rapaljer><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=rapaljer><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=2722\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> You are right to say, <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+pi%2A+r%5E2 ALIGN=MIDDLE  ALT=\"A+=+pi%2A+r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >, where pi is approximately 3.14 or also approximately <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=22%2F7 ALIGN=MIDDLE  ALT=\"22%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  I checked out the problem and because the area is given as 154 square centimeters, they used <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=22%2F7+ ALIGN=MIDDLE  ALT=\"22%2F7+\"   DISABLED_style= \"max-width:90%; height:auto;\" > as the approximation for pi.  \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=A+=+pi%2A+r%5E2 ALIGN=MIDDLE  ALT=\"A+=+pi%2A+r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=154+=+%2822%2F7%29%2A+%28r%5E2%29 ALIGN=MIDDLE  ALT=\"154+=+%2822%2F7%29%2A+%28r%5E2%29\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "To solve for <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2 ALIGN=MIDDLE  ALT=\"r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" >, you can divide both sides by <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=22%2F7 ALIGN=MIDDLE  ALT=\"22%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" >.  Since this will get ugly looking, you might want instead to MULTIPLY both sides of the equation by the reciprocal of <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=22%2F7 ALIGN=MIDDLE  ALT=\"22%2F7\"   DISABLED_style= \"max-width:90%; height:auto;\" >, which is <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7%2F22 ALIGN=MIDDLE  ALT=\"7%2F22\"   DISABLED_style= \"max-width:90%; height:auto;\" >.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "It looks like this:\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=154%2A%287%2F22%29=+%2822%2F7%29%2A%287%2F22%29+%2A+r%5E2+ ALIGN=MIDDLE  ALT=\"154%2A%287%2F22%29=+%2822%2F7%29%2A%287%2F22%29+%2A+r%5E2+\"   DISABLED_style= \"max-width:90%; height:auto;\" >\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "Amazingly enough, the 22 in the denominator on the left side of the equation just happens to divide evenly into 154, and it goes 7 times.  So you will have\r<BR>\n" );
document.write( "\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=7%2A7+=+r%5E2 ALIGN=MIDDLE  ALT=\"7%2A7+=+r%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" > \r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "So if <IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=r%5E2+=+49 ALIGN=MIDDLE  ALT=\"r%5E2+=+49\"   DISABLED_style= \"max-width:90%; height:auto;\" >, then <BR>\n" );
document.write( "r= 7 or r= -7.  The radius cannot be negative, so r= 7 centimeters.\r<BR>\n" );
document.write( "<BR>\n" );
document.write( "\n" );
document.write( "R^2 at SCC\r<BR>\n" );
document.write( "\n" );
document.write( " \r<BR>\n" );
document.write( "\n" );
document.write( " </SPAN>\n" );
document.write( "</TD></TR></TABLE>\n" );