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in JEE by (174 points)

is (x-3)2 +(y+2)2 =5r2 to the circle (x-3)2 + (y+2)2 =r2 is 16 unit ,then the area between the two circles in sq. unit is :

  • 32pi
  • 8pi
  • 4pi
  • 256pi
  • 16pi

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1 Answer

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Let point P(x1,y1) be any point on the circle, therefore it satisfy the circle  

(x1−3)2+(y1+2)2=5r2 ...(i) 

The length of the tangent drawn from point P(x1,y1) to the circle 

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