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

(x-2)^2 + (y-1)^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

(x-2)^2+(y-1)^2=40

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

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