Chord or Tangent???

Geometry Level 3

There are 4 circles namely A, B, C & D (as shown in figure) of radius 1 cm each and centres at (-3,0)(-1,0) (1,0) & (3,0) respectively consribed in a bigger circle of radius 4 and centre at (0,0) Chhord of the bigger cirlce is tangent to the circle B and passes through the centre of cirlce C. The Length of the Chord is \(\sqrt{x}\). Find \(x\).

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