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      Question

      Two circles of radii 10 cm and 5 cm touch each other

      externally at a point A. PQ is the direct common tangent of those two circles of centres O ₁ and O ₂ respectively. The length of PQ is equal to
      A 10√2 cm Correct Answer Incorrect Answer
      B 8√2 cm Correct Answer Incorrect Answer
      C 9√2 cm Correct Answer Incorrect Answer
      D 6√2 cm Correct Answer Incorrect Answer

      Solution

      Direct common tangent = 2 × √ (r ₁ × r2) 2 x √ (10 x 5) =10√ 2 cm

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