Quantcast

A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

elizabethann509

  • 2 years ago

I don't understand the equation for a circle. (x - h)2 + (y - k)2 = r2 Can someone please explain it to me?

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

    (h,k) represents the center, and r represents the radius. To help your understanding, try coming up with a few simple circles and graphing them.

  2. elizabethann509
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    I don't understand how to solve the equation when the numbers are put in

  3. elizabethann509
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    For example, something like this: (x - 3)2 + (y - 7)2 = 25

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

    Basically, think of it like this. (h, k) is the center right? Since it says - h and - k in the circle equation, just bypass it and reverse the sign when putting it in or taking it out of the equation. Example: (x - 9)^2 + (y + 4)^2 = 9 The center is (9, -4) and the radius is 3. Just reverse the sign.

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

    This is the general equation for a circle, it isn't a specific circle. For a specific circle, the h, k, and r will all be defined. So you'll have, for example, \((x-1)^2+(y-2)^2=5^2.\) This would be a circle centered around (1,2) with radius 5. That just means that any x and y that make the equation true are on the circle.

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

    See how the signs are opposites?

  7. elizabethann509
    • 2 years ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yeah that makes sense.

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

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.