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Equation of a circle with radius r, and center at (h, k).
\((x - h)^2 + (y - k)^2 = r^2\)

@biddyB
Are you there?

Sorry I was actually wrong! mathstudent55 is right. Sorry for the confusion!

Ok, whew, I was really confused for a second. Thats ok, I get it now, thanks

How do I find the radius?

First, find the center.

0?

|dw:1438645154737:dw|

It's easier if you measure along a horizontal or a vertical line.

|dw:1438645313174:dw|

3?

Now we just simplify to:
\(\large x^2 + y^2 = 9\)
That is the answer.

Thank you! that was really well explained, I get it

For this one r=4? that seems too simple @mathstudent55

(3,5)?

(x-3)^2 +(y-5)^2=4^2 ?

Correct.

That's it, it doesn't get simplified any more?