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Question

Equation of the circle having centre at (3,1) and making an intercept of length 6 units on the line 2x5y+18=0, is

A
x2+y26x+2y18=0
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B
x2+y26x+2y38=0
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C
x2+y26x+2y28=0
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D
x2+y26x+2y48=0
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Solution

The correct option is C x2+y26x+2y28=0

Length of perpendicular from C(3,1)
d=6+5+184+25=29 units
If the radius of required circle is r
then, AB=2r2d2
3=r229
r=38 units
Thus, equation of circle is
(x3)2+(y+1)2=38
x2+y26x+2y28=0

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