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BIGDOG96 Group Title

Patrick drew the incorrect graph shown below to represent the circle (x – 1)2 + (y + 3)2 = 4 Which statement explains why Patrick’s graph is incorrect? Answers A. The radius of the circle should be 2 instead of 4. B. The center of the circle should be (1, 9) instead of (1, -3). C. The center of the circle should be (-1, 3) instead of (1, -3). D. The radius of the circle should be 16 instead of 4.

  • one year ago
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  1. BIGDOG96 Group Title
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    @PaxPolaris can you help me?

    • one year ago
  2. PaxPolaris Group Title
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    a circle with center \((h,k)\) and radius \(r\) will have the formula: \[\Large \left( x-h \right)^2+\left( y-k \right)^2=r^2\]

    • one year ago
  3. BIGDOG96 Group Title
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    Okay

    • one year ago
  4. PaxPolaris Group Title
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    so in your formula: what's the center supposed to be? and what's the radius is supposed to be?

    • one year ago
  5. BIGDOG96 Group Title
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    1, -3 r=4?

    • one year ago
  6. PaxPolaris Group Title
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    center is (1,-3)... yes but \(\large r \ne 4\) \[\Large \color{green}{r^2=4}\]

    • one year ago
  7. BIGDOG96 Group Title
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    So r = 2?

    • one year ago
  8. BIGDOG96 Group Title
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    Or 16?

    • one year ago
  9. PaxPolaris Group Title
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    2... you got it.

    • one year ago
  10. BIGDOG96 Group Title
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    Great, thanks a million!

    • one year ago
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