document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=720351>Question 720351</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The diameter of a penny is about 1.9 x 10^-5 km. It would take about 2.1 x 10^9 pennies placed end to end to circle the equator once. What is the approximate length of the equator?<BR>\n" );
document.write( "I think this is a division problem, I appreciate any help  </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #441781 by </B><A HREF=/tutors/aboutme.mpl?userid=solver91311><B>solver91311(24713)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=solver91311><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=solver91311><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=441781\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> <font face=\"Times New Roman\" size=\"+2\">\r<BR>\n" );
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document.write( "Let's see if your idea makes any sense.  If it is a division problem we either have to divide the diameter of a penny, order of magnitude 10^-5 km, by the number of pennies that go around the equator, order of magnitude 10^9, getting an answer of order of magnitude 10^-14 km, roughly 100,000 times smaller than a human hair.  Nope.\r<BR>\n" );
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document.write( "Or we have to divide 10^9 by 10^-5, making 10^14 km which is roughly the diameter of our entire solar system out to the outer planets.  Nope.\r<BR>\n" );
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document.write( "Let's multiply:  2.1 X 10^9 times 1.9 X 10^-5 = 4.0 X 10^4 or about 40,000 km, which is about 24,900 miles.  Very close to Eratosthene's result circa 240 BCE.\r<BR>\n" );
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document.write( "John<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=\"/cgi-bin/rendertex.cgi?\LARGE e^{i\pi}\ +\ 1\ =\ 0\"><BR>\n" );
document.write( "<font face=\"Math1\" size=\"+2\">Egw to Beta kai to Sigma</font><BR>\n" );
document.write( "My calculator said it, I believe it, that settles it<BR>\n" );
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