document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=566231>Question 566231</A>: <I><SPAN STYLE=\"word-break: break-all;\"> The Greek mathematician Eratosthenes (ca. 276-195 B.C.) measured the circumference of the earth from the following observations. He noticed that on a certain day the sun shone directly down a deep well in Syene (modern Aswan). At the same time in Alexandria, 500 miles north (on the same meridian), the rays of the sun shone at an angle of 7.2° to the zenith. Use this information and the figure to find the radius of the earth. (Round your answer to the nearest ten miles.)<BR>\n" );
document.write( "  mi\r<BR>\n" );
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document.write( "Use this information and the figure to find the circumference of the earth.<BR>\n" );
document.write( "  mi </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #366197 by </B><A HREF=/tutors/aboutme.mpl?userid=scott8148><B>scott8148(6628)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=scott8148><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=scott8148><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=366197\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> the 7.2º is the size of the arc on the Earth's circumference covered by 500 mi </SPAN>\n" );
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