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The equation of this circle is (x-h)^2 + (y-k)^2= r^2
Plug the values in and boom

Okay, in this case, 5 is h and -9 is k and 12 is r

If you input those value into that equation and simplify, you should get your answer

Well, you have r^2 so it would be 12^2 which is 144

other than that you are right

actually i wrote the question wrong. its D

I meant i wrote the answers wrong

I'm getting B

The equation you put the numbers into makes it negative

(x-h)^2 + (y-k)^2= r^2
It's "x-h" h is 5.
so, x-5

You're welcome

You just gotta be careful with signs, it's really easy to accidentally do make a mistake

Yea, I can try depends on what it is

I'm pretty sure it's B

http://www.mathsisfun.com/geometry/construct-trianglecircum.html

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