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anonymous

  • one year ago

Please help! I only have about 20 minutes for this problem! A circle has its center at (2, -4) and a radius of 6 units. What is the equation of the circle?

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  1. ♪Chibiterasu
    • one year ago
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    Do you know how to form an equation for a circle?

  2. anonymous
    • one year ago
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    Not really, I didn't understand that part in my math lesson quite well. It's the only thing I'm struggling with.

  3. Mertsj
    • one year ago
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    Why do you only have 20 minutes for this question?

  4. anonymous
    • one year ago
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    I'm going somewhere in 20 minutes but this was a last minute thing. :/

  5. Mertsj
    • one year ago
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    What is the (h,k) form of the equation of a circle?

  6. ♪Chibiterasu
    • one year ago
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    The circle's center is not at the origin so we will be using the h, k equation. \[(x - h)^2 + (y - k)^2 = r^2\] You just . . . fill it in. This is really all you need to know. If the center is at the origin just use: \[x^2 + y^2 = r^2\]

  7. ♪Chibiterasu
    • one year ago
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    You fill in for h and k, not for x and y.

  8. ♪Chibiterasu
    • one year ago
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    Remember to alternate the signs when necessary!

  9. anonymous
    • one year ago
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    (x - h)^2 + (y - k)^2 = r^2 (h, k) = center and r = radius so for when its center is at (2, -4) and it has a radius of 6 plug in h=2 , k=-4 , and r=6 into the circle equation ?? That correct?

  10. ♪Chibiterasu
    • one year ago
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    yeah

  11. ♪Chibiterasu
    • one year ago
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    Remember that inputting negatives will switch the - to a +

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