Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

xRAWRRx3

In the diagram below of circle C, QR is a diameter, and Q(1, 8) and C(3.5 , 2) are points on a coordinate plane. Find and state the coordinates of point R.

  • one year ago
  • one year ago

  • This Question is Closed
  1. xRAWRRx3
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1339302689432:dw|

    • one year ago
  2. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    Use the midpoint formula, but work back wards. (3.5, 2) = (x_1 + x_2/2, y_1 + y_2/2) (7, 4) = (1 + x_2, 8 + y_2) (6, -4) = (x_2, y_2) Therefore, (6, -4)

    • one year ago
  3. aceace
    Best Response
    You've already chosen the best response.
    Medals 0

    (x-3.5)^2 + (y-2)^2 = 6.5^2

    • one year ago
  4. xRAWRRx3
    Best Response
    You've already chosen the best response.
    Medals 0

    wait, I'm still confused about how to get it...

    • one year ago
  5. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    What are you confused on?

    • one year ago
  6. aceace
    Best Response
    You've already chosen the best response.
    Medals 0

    (x- the x co ordinate of c)^2 + (y- the y co ordinate of C) ^2 = the radius squared

    • one year ago
  7. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    Point C is the midpoint and therefore you can work backwards using the midpoint formula.

    • one year ago
  8. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    @aceace I think you misread the question...

    • one year ago
  9. xRAWRRx3
    Best Response
    You've already chosen the best response.
    Medals 0

    how do I work backwords though?

    • one year ago
  10. aceace
    Best Response
    You've already chosen the best response.
    Medals 0

    soory if i mis read the question

    • one year ago
  11. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    3.5 = (1 + x)/2 7 = 1 + x x = 6 The x coordinate of R is 6. Then work with y. 2 = (8 + y)/2 4 = 8 + y y = -4 Therefore, the y-coordinate of R is -4. R(6, -4)

    • one year ago
  12. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    Just focus on one of the values. FOr instance, what I did up there is start with x and then y.

    • one year ago
  13. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    Do you get it?\[M(x, y) = ((x_{1} + x_{2})/2, (y_{1} + y_{2})/2)\]

    • one year ago
  14. xRAWRRx3
    Best Response
    You've already chosen the best response.
    Medals 0

    OHHH. Oh I'm sorry, I was really confused from when you meant backwards but I get it now LOL thank you SO much x)

    • one year ago
  15. Calcmathlete
    Best Response
    You've already chosen the best response.
    Medals 1

    lol. Alright. You're welcome :)

    • one year ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.