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)`.

`r_1 r_2`

`2r_1 r_2`

`3 r_1 r_2`

`4r_1 r_2`

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LUCENT PUBLICATION-CIRCLE AND ITS TANGENT LINES-EXERCISE 8B

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