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anonymous

  • one year ago

What is the general form of the equation for the given circle?

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  1. anonymous
    • one year ago
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  2. anonymous
    • one year ago
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    do you know the equation for a circle centered at origin?

  3. anonymous
    • one year ago
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    x2+y2+r2

  4. anonymous
    • one year ago
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    or just the general form

  5. anonymous
    • one year ago
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    Do you know the general form?

  6. anonymous
    • one year ago
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    oh and that should be = r^2 not plus r^2

  7. anonymous
    • one year ago
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    thats what i meant

  8. anonymous
    • one year ago
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    (x-h)^2 + (y-k)^2 = r^2 is the general form

  9. anonymous
    • one year ago
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    (h,k) is the origin so you need to figure out what the origin is

  10. anonymous
    • one year ago
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    Do you know what it is?

  11. anonymous
    • one year ago
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    how do i find it?

  12. anonymous
    • one year ago
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    do you know the equation of the vertical and horizontal lines?

  13. anonymous
    • one year ago
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    4 & 7??

  14. anonymous
    • one year ago
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    the form for the equation of a vertical line is x=c (c is a constant) horizontal is is y=c

  15. anonymous
    • one year ago
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    so the vertical line is x=4

  16. anonymous
    • one year ago
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    and the horizontal line is y=4

  17. anonymous
    • one year ago
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    so your origin is (4,4)

  18. anonymous
    • one year ago
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    now you need to find the radius and plug into the equation for a circle

  19. anonymous
    • one year ago
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    is the radius 5?

  20. anonymous
    • one year ago
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    no. How did you get 5?

  21. anonymous
    • one year ago
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    i dont understand how to get it

  22. anonymous
    • one year ago
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    the radius is the distance from the origin to an endpoint on the circle

  23. anonymous
    • one year ago
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    9

  24. anonymous
    • one year ago
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    how did you get 9?

  25. anonymous
    • one year ago
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    subtract the y coordinate of the origin from the y coordinate of the endpoint connected by the vertical line

  26. anonymous
    • one year ago
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    4-4?

  27. anonymous
    • one year ago
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    that would be subtracting the x coordinate from the y coordinate.

  28. anonymous
    • one year ago
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    try drawing the circle on graph paper with origin (4,4) and it should become clear

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