Posted by Adam on Saturday, February 5, 2011 at 6:41am.
The point (4.3) lies on a circle whose center is at (2,1). Find an equation of this circle.

Math  Reiny, Saturday, February 5, 2011 at 6:55am
start with the equation
(x2)^2 + (y1)^2 = r^2
sub in the point (4,3) to find r^2

Math  Adam, Saturday, February 5, 2011 at 7:01am
Is the answer
(x2)^2+(y1)^2=40

Math  Reiny, Saturday, February 5, 2011 at 7:04am
correct
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