document.write( "Question 39797: Write an equation of the circle whose center is at the origin and the point (3,-6) is on the circle.\r
\n" ); document.write( "\n" ); document.write( "I know the the formula to use is this:\r
\n" ); document.write( "\n" ); document.write( "(x-h)squared + (y-k)squared = r squared \n" ); document.write( "

Algebra.Com's Answer #25223 by Nate(3500) $\"\"$ $\"About$

You can put this solution on YOUR website!
The radius is the distance from the middle to one point on the circle, so use the formula for distance:
\n" ); document.write( " $\"d+=+sqrt%28%28y+-+y%29%5E2+%2B+%28x+-+x%29%5E2%29\"$
\n" ); document.write( " $\"d+=+sqrt%28%28-6+-+0%29%5E2+%2B+%283+-+0%29%5E2%29\"$
\n" ); document.write( " $\"d+=+sqrt%2845%29\"$
\n" ); document.write( "The formula for the circle: $\"y%5E2+%2B+x%5E2+=+45\"$ \n" ); document.write( "

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