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Two circle S1=0,S2=0 of equal radius 'r'...

Two circle `S_1=0,S_2=0` of equal radius 'r' intersect such that one circle passes through the centre of the other circle. Another circle (S=0) touches `S_1=0` internally and `S_2=0` externally and also touches the line joining the centres of the two circles `S_1=0` and `S_2=0` .Then radius of S=0 is

A

`(sqrt3r)/2`

B

`(sqrt3r)/4`

C

`(sqrt3r)/8`

D

none of these

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The correct Answer is:
B
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