The circle C(1) of radius (sqrt(3)+1) ha...

The circle `C_(1)` of radius `(sqrt(3)+1)` has chord AB which touch another circle `C_(2)` which is concentric to `C_(1)`. If radius of `C_(2)` is `(sqrt(3)-1)` then length of AB (in cm) will be.

`2root4(3)`

`8sqrt(3)`

`4root4(3)`

`4sqrt(3)`

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