Results are out! Find what you Get quick advice or join the chat
Hey! Sign in to get help with your study questionsNew here? Join for free to post

C2 Coordinate geometry

Announcements Posted on
  1. Offline

    Here are the questions:

    1) The points A(-3,19), B(9,11) and C(-15,1) lie on the circumference of a circle. Find the coordinates of the centre of the circle.

    Midpoint = (-3+9/2, 19+11/2) = (-3,15)

    11-19/9+3 = -3/4


    Did the same for the other one, and got: M.P.(9,10) and 2y=3x-7

    (4y=-3x+51) + (2y=3x+7) -> 6y=44 -> y=44/6=22/3

    Is this right so far?

    2) Find the distance between (-4a,0) and (3a,-2a)

    =√[49a2+4a2 = √53a2

    Would the answer be √53a or 53a?
  2. Offline

    It is 53a, because the square root cancels out with the squared. Remember it is \sqrt{(53a)}^2.
  3. Offline

  4. Offline

    (Original post by Math12345)
    It is 53a, because the square root cancels out with the squared. Remember it is sqrt(53a)^2
    No it isn't


Submit reply


Thanks for posting! You just need to create an account in order to submit the post
  1. this can't be left blank
    that username has been taken, please choose another Forgotten your password?
  2. this can't be left blank
    this email is already registered. Forgotten your password?
  3. this can't be left blank

    6 characters or longer with both numbers and letters is safer

  4. this can't be left empty
    your full birthday is required
  1. By joining you agree to our Ts and Cs, privacy policy and site rules

  2. Slide to join now Processing…

Updated: April 7, 2012
New on TSR

Your TSR exam season toolkit

Everything you need to know about study help on TSR

Study resources
Article updates
Quick reply
Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.