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In Fig. 10.102, Q R is a common tangent ...

In Fig. 10.102, `Q R` is a common tangent to the given circles touching externally at the point `T` . The tangent at `T` meets `Q R` at `P` . If `P T=3. 8 c m` , then the length of `Q R` (in cm) is (FIGURE) (a) 3.8 (b) 7.6 (c) 5.7 (d) 1.9

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