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January 31, 2015

January 31, 2015

Posted by **Bree** on Wednesday, September 23, 2009 at 7:41pm.

Please help!

- Algebra -
**Reiny**, Wednesday, September 23, 2009 at 8:02pmrecall the equation of a circle with centre (h,k) and radius r is

(x-h)^2 + (y-k)^2 = r^2

so

(x-4)^2 + (y-2)^2 = r^2

but (-1,-1) lies on it

sub x=-1 and y=-1 to find r^2

let me know what you get.

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