Quantcast

A community for students. Sign up today!

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

xRAWRRx3

  • 2 years ago

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.

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

    |dw:1339302689432:dw|

  2. Calcmathlete
    • 2 years ago
    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)

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

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

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

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

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

    What are you confused on?

  6. aceace
    • 2 years ago
    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

  7. Calcmathlete
    • 2 years ago
    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.

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

    @aceace I think you misread the question...

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

    how do I work backwords though?

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

    soory if i mis read the question

  11. Calcmathlete
    • 2 years ago
    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)

  12. Calcmathlete
    • 2 years ago
    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.

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

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

  14. xRAWRRx3
    • 2 years ago
    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)

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

    lol. Alright. You're welcome :)

  16. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Ask a Question
Find more explanations on OpenStudy

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.