1.

The two circles (x-a)^(2)+y^2=c and (y-b)^(2)+x^(2)=4c have only one real common tangent then

Answer»

`a^(2)+B^(2)=C`
`b^(2)+c^(2)=a^(2)`
`a^(2)+b^(2)=4C^(2)`
`a^(2)+b^(2)=9C`

ANSWER :A


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