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      Question

      If distance between two pillars of length 9 & 4 cm is x

      cm. If two angle of elevation of their respective top from a point on ground of other are complementary to each other, then value of x is
      A 12 cm Correct Answer Incorrect Answer
      B 6 cm Correct Answer Incorrect Answer
      C 24 cm Correct Answer Incorrect Answer
      D 30 cm Correct Answer Incorrect Answer

      Solution

      Let A and B are the angles of elevation of given 2 pillars As we know that  tan A x tan B =  1 when A and B are complementary angles (4/x) X (9/x) = 1 x2  = 36 x = 6 cm 

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