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Q.

The equation of the circle having radius ‘5’ and which touches the line 3x + 4y -11 = 0 at the point (1,2)

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a

(x3)2+(y+1)2=25

b

(x+3)2+(y+1)2=25

c

(x+5)2+(y+5)2=25

d

(x5)2+(y+5)2=25

answer is A.

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Detailed Solution

 Centre C=(1±5cosθ,2±5sinθ)

1±5,45,2±535

Question Image

C=(5,5) or C=(3,1)

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The equation of the circle having radius ‘5’ and which touches the line 3x + 4y -11 = 0 at the point (1,2)