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Fools101

  • 3 years ago

help please!!! Geometry! How do i do this?! Equations of Circles Find the equation of the circle with the given center and radius. C(0, 0), r = 4 A) (x + 4)2 + (y + 4)2 = 4 B) x2 + y2 = 4 C) x2 + y2 = 16 D) (x - 2)2 + (y - 2)2 = 16

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  1. ghass1978
    • 3 years ago
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    C

  2. jesusisrisen
    • 3 years ago
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    C

  3. Fools101
    • 3 years ago
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    thank u but how did u get that answer? Find the equation of the circle with the given center and radius. C(2, -1); r = 3 A) (x + 2)2 + (y - 1)2 = 3 B) (x - 2)2 + (y + 1)2 = 9 C) (x + 2)2 + (y - 1)2 = 9 D) (x - 2)2 + (y + 1)2 = 3

  4. Ringlum
    • 3 years ago
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    The equation of a circle is (x-xc)^2 + (y-yc)^2 = r^2 where (xc,yc) are the coordinates of the center and r is the radius. Replace to verify that it is C

  5. satellite73
    • 3 years ago
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    \[(x-h)^2+(y-k)^2=r^2\] is general equation for circle with center (h,k) radius r

  6. satellite73
    • 3 years ago
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    in your case you have \[h=2,k=-1,r=9\] so you get \[(x-2)^2+(y+1)^2=9\]

  7. satellite73
    • 3 years ago
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    sorry i meant \[h=2,k=-1,r=3\]

  8. Fools101
    • 3 years ago
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    oh so 2 is A?!

  9. Fools101
    • 3 years ago
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    I get a little thank u...

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