Let the latus ractum of the parabola ...

Let the latus ractum of the parabola `y^(2) = 4x` be the comon chord to the circles `C_(1)` and `C_(2)` each of them having radius `2 sqrt(5)` . Then , the distance the centre of the circles `C_(1)` and `C_(2)` is :

`4sqrt(5)`

`8sqrt(5)`

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