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      Question

      The distance between the centres of two circles of radii

      7 cm and 5 cm is 15 cm. Find the length of the transverse common tangent to these circles. 
      A 7 cm Correct Answer Incorrect Answer
      B 13 cm Correct Answer Incorrect Answer
      C 11 cm Correct Answer Incorrect Answer
      D 9 cm Correct Answer Incorrect Answer

      Solution

      ATQ, d = 15 cm, r 1 = 7 cm, r 2 = 5 cm

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