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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

(a) `3.8`

B

(b) `7.6`

C

(c) `5.7`

D

(d) `1.9`

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The correct Answer is:
B
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