My Math Forum Find a circle's equation

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 August 28th, 2017, 06:43 PM #1 Member   Joined: May 2015 From: U.S.A. Posts: 45 Thanks: 0 Find a circle's equation After giving the equation for circles ( $\displaystyle (x - h)^{2} + (y - k)^{2} = r^{2}$ , the question says: "Find the equation of a circle with radius of 3 and center (-2, 5)." At first I solved for x and y individually by respectively substituting the other with 0 (i.e. solving for y: $\displaystyle (0 + 2)^2 + (y - 5)^2 = 9$) But is it just asking for this: $\displaystyle (x + 2)^2 + (y - 5)^2 = 9$ ? It's on a review sheet with many many different topics, so this is the only of its kind I can look at; no other examples of this sort.
 August 28th, 2017, 08:10 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,174 Thanks: 1143 you just have to plug in $h=-2$ $k=5$ $r=3$ Thanks from Rexan
 August 28th, 2017, 08:52 PM #3 Member   Joined: May 2015 From: U.S.A. Posts: 45 Thanks: 0 Okay, thank you! I'll respond to your reply on my other question probably tomorrow. (Changing a proportion by adding more) I just had a bunch of birthday cake and I'm getting sleepy, so my brain's not processing things properly.

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