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Two circles of radius r(1) and r(2) touc...

Two circles of radius `r_(1) and r_(2)` touches externally at point A have a common tangent PQ. Then find the value of `PQ^(2)`.

A

`r_(1)r_(2)`

B

`2r_(1)r_(2)`

C

`3r_(1)r_(2)`

D

`4r_(1)r_(2)`

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