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JEE Main 2019 · 10 Jan · Shift I

JEE Main 2019 Mathematics question on Circles

If a circle CC passing through the point (4,0)(4, 0) touches the circle x2+y2+4x−6y=12x^2 + y^2 + 4x - 6y = 12 externally at the point (1,−1)(1, -1), then the radius of CC is
  1. A.
    5
  2. B.
    252\sqrt{5}
  3. C.
    57\sqrt{57}
  4. D.
    4
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Correct option: A

[JEE Main 2019 · 10 Jan · Shift I]

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