1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Equation of a circle

  1. Oct 18, 2009 #1
    1. The problem statement, all variables and given/known data

    find the equation of a circle with centre of (2,-4) and y-intercept 1

    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 18, 2009 #2
    The equation of a circle of radius r centered at the point (a,b) is given by (x-a)2+(y-b)2=r2. Since you already are given the point (a,b), all you need to find is the radius of the circle. Can you use the information that a y-intercept is (0,1) to find the radius?
     
  4. Oct 18, 2009 #3
    Thank you so much I didn't know it was that simple xD ok then can I ask something else:

    A circle with a centre (5,4) intersects the x-axis 3 units from the origin. Find the possible equations of the circle.

    Never mind i got it :D
     
    Last edited: Oct 18, 2009
  5. Oct 19, 2009 #4
    Ok, cool!
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Equation of a circle
  1. Equation of a circle (Replies: 2)

  2. Equation of a circle (Replies: 9)

  3. Equation of a circle (Replies: 11)

  4. Equation of circle (Replies: 6)

  5. Equation of a Circle (Replies: 2)

Loading...