\r\n" );
document.write( "Ellipses like this 
have equations of this form with aČ under the term in x \r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "Ellipses like this 
have equations of this form with aČ under the term in y \r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "a is always greater than b, and of course aČ is greater than bČ.\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "\r\n" );
document.write( "The center is (h,k), the semi-major axis is a, the semi minor axis is b.\r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "Since the denominator 81 is larger than the denominator 25, so we know\r\n" );
document.write( "this is an ellipse that looks like this \r\n" );
document.write( "\r\n" );
document.write( "By comparison h=5, k=9, aČ=81, bČ=25, and so a=9, b=5\r\n" );
document.write( "\r\n" );
document.write( "So the center is (h,k) = (5,9). The major axis is 2a=18, and the minor\r\n" );
document.write( "axis is 2b=10, and the two axes bisect each other at the center (5,9), \r\n" );
document.write( "so we draw this:\r\n" );
document.write( "\r\n" );
document.write( "
\r\n" );
document.write( "\r\n" );
document.write( "Edwin
\n" );
document.write( "![\"\"](\"/images/stars/stars-13.gif\")
