Posted by Smithen on Thursday, May 31, 2012 at 10:41pm.
The standard equation of a circle with center C ( h , k ) and radius r is as follows:
( x - h )^ 2 + ( y - k )^ 2 = r ^ 2
In your case r = sqrt( 25 ) = + OR - 5
Length can't be negative so r = 5
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