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August 28th, 2017, 05:43 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, 07:10 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 1,975 Thanks: 1026 
you just have to plug in $h=2$ $k=5$ $r=3$ 
August 28th, 2017, 07:52 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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circle, equation, find 
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