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anonymous

  • one year ago

Which is an equation of the circle with a radius of 9 units and center at (–4, 2)? (x − 9)2 + (y + 4)2 = 4 (x − 4)2 + (y + 2)2 = 81 (x + 4)2 + (y − 2)2 = 81 (x − 2)2 + (y + 4)2 = 81

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  1. anonymous
    • one year ago
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    @Teddyiswatshecallsme do you know this?

  2. anonymous
    • one year ago
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    Equation of a circle: \[(x - h)^2 + (y - k)^2 = r^2\]

  3. anonymous
    • one year ago
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    h and k represent the x and y coordinates of the center of the circle

  4. anonymous
    • one year ago
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    r represents the radius

  5. anonymous
    • one year ago
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    The center is (–4, 2) and h represents -4 and k represents 2. 9 is the radius of the circle and we have to square that = 81.

  6. anonymous
    • one year ago
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    okay that makes sense. i just googled it after awhile

  7. anonymous
    • one year ago
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    Okay so now plug those values into the original formula of the circle

  8. anonymous
    • one year ago
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    (x+4)^2 +(y-2)^2 = 81

  9. anonymous
    • one year ago
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    Correct :)

  10. anonymous
    • one year ago
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    So what answer should that be?

  11. anonymous
    • one year ago
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    c

  12. anonymous
    • one year ago
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    Yup

  13. anonymous
    • one year ago
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    could you help me with another one?

  14. anonymous
    • one year ago
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    Sure. Just post it separately

  15. anonymous
    • one year ago
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    okay

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