document.write( "Question 681672: need to understand how to get center and radius and then graph this equation?
\n" ); document.write( "x squared + y squared=1 \n" ); document.write( "
Algebra.Com's Answer #422734 by jim_thompson5910(35256)\"\" \"About 
You can put this solution on YOUR website!
x^2 + y^2 = 1\r
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\n" ); document.write( "\n" ); document.write( "can be rewritten as \r
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\n" ); document.write( "\n" ); document.write( "(x-0)^2 + (y-0)^2 = 1^2\r
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\n" ); document.write( "\n" ); document.write( "and that is in the form \r
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\n" ); document.write( "\n" ); document.write( "(x-h)^2+(y-k)^2=r^2, which is a circle with radius r and center (h,k)\r
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\n" ); document.write( "\n" ); document.write( "Since h = 0, k = 0 and r = 1, the center of x^2 + y^2 = 1 is (0,0) and it has a radius of 1 unit. This is a special circle known as the unit circle (which you'll use a lot in trigonometry).\r
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\n" ); document.write( "\n" ); document.write( "The graph looks like this\r
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