1.

PQ is a direct common tangent of two circles of radii r_(1) and r_(2) touching each other externally at A. Then the value of PQ^(2) is :

Answer»

`r_(1) r_(2)`
`2r_(1) r_(2)`
`3r_(1) r_(2)`
`4 r_(1) r_(2)`

Answer :D


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