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In figure, QR is a common tangent to the...

In figure, QR is a common tangent to the given circles, touching externally at the point T. The tangent at T meets QR at P.
If PT=3.8cm, then the length of QR(in cm) is

A

3.8 cm

B

7.6 cm

C

5.7 cm

D

1.9 cm

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