Q43 / 90 · JEE Main 2016 (03 Apr) · Mathematics

If one of the diameters of the circle, given by the equation, x2+y2-4x+6y-12=0, is a chord of a circle S, whose centre is at -3, 2, then the radius of S is

  • A
    5
  • B
    10
  • C
    52
  • Correct answer
    D
    53

Solution

The centre of the given circle x2+y2-4x+6y-12=0 is 2, -3 and the radius is 5.

​​​​​​​Figure

The distance between the centres 52 and radius is 5. The triangle OPQ is a right angled triangle

OQ= 522+52= 532=53

Hence answer is 53

Hence, the correct answer is option: 'D'.

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