1.

If two circles x ^(2) + y ^(2) + 2gx + 2fy =0 and x ^(2) +y ^(2) + 2g _(1) x + 2f _(1) y =0 touch each other, then

Answer»

`f_(1) G = f g _(1)`
`f f _(1) = g g_(1)`
`f ^(2) +g ^(2) =f _(1) ^(2) + g _(1) ^(2)`
NONE of these

Answer :A


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