1.

A circle S cuts three circlesx^(2)+ y^(2) - 4x - 2y + 4 = 0 , x^(2) + y^(2) - 2x - 4y + 1 = 0 " and " x^(2) + y^(2) + 4x + 2y + 1 = 0orthogonally . Then the radius of S is

Answer»

`(sqrt(29))/(8)`
`(sqrt(28))/(11)`
`(sqrt(29))/(7)`
`(sqrt(29))/(5)`

ANSWER :A


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