MathematicsIn figure QR is a common tangent to the given circles, touches externally at point T. The tangent T meets QR at P. If PT = 3.8 cm then find the length of QR.

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


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  1. A
    3.8
  2. B
    7.6
  3. C
    5.7
  4. D
    1.9 

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    Solution:

    Tangents drawn from an external point to a circle are equal.
    PQ = PT = PR = 3.8 cm
    QR = QP + PR = 3.8 + 3.8 = 7.6 cm
    So, Option 2 is correct.
     
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