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Three circle C(1),C(2)andC(3) with radii...

Three circle `C_(1),C_(2)andC_(3)` with radii `r_(1),r_(2)` and `r_(3)` (where `r_(1)ltr_(2)ltr_(3)`) are placed as shown in the given figure. What is the value of `r_(2)`?

A

`sqrt((r_(1)r_(3)))`

B

`(r_(1)+r_(3))//2`

C

`(2r_(1)r_(3))//(r_(1)+r_(3))`

D

`sqrt((r_(1)+r_(3)))`

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