What is the equation of the circle with center (2, -5) that passes through the point (–2, 10)?

Question

jdoe0001 · Answer

do  you know what the "circle formula" is?

anonymous · Answer

Yes

anonymous · Answer

(x - h)^2 + (y - k)^2 =r^2

So, (2 - -2)^2 + (-5 - 10)^2?

jdoe0001 · Answer

ok, well, you're given the (h,k) for the center, which are the "x" and "y" coordinates, which is your 1st point up there now, you just need the radius you have a 2nd point, from the center to a point in the circle, that'd give you the radius since you have 2 points, just use the distance formula to get the distance from THAT point to THE center point, and that'd give you the radius http://0.tqn.com/d/math/1/0/A/1/distance.gif

jdoe0001 · Answer

well, yeah, your way also works :)

anonymous · Answer

(x – (–2))^2 + (y – 10)^2 = 241