
Algebra PreAlgebra and Basic Algebra Math Forum 
 LinkBack  Thread Tools  Display Modes 
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: 2,375 Thanks: 1276 
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. 

Tags 
circle, equation, find 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Find the equation of a circle  shiseonji  Algebra  6  March 21st, 2014 06:46 PM 
How to find the other equation of circle  shiseonji  Algebra  3  February 8th, 2014 12:54 PM 
Find The Equation Of A Circle That Is...  soulrain  Algebra  8  January 7th, 2012 02:48 PM 
I can't figure out how to find the equation of this circle.  therenaissancedan  Algebra  8  August 11th, 2010 03:06 PM 
Find equation of this circle  aschenbr.rach  Applied Math  1  March 8th, 2010 08:56 AM 