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      Question

      In the given figure, ADEF is a rectangle. ∠CBE = 70°,

      find the value of X.
      A 60° Correct Answer Incorrect Answer
      B 70° Correct Answer Incorrect Answer
      C 40° Correct Answer Incorrect Answer
      D 50° Correct Answer Incorrect Answer

      Solution

      Each interior angle of rectangle = 90°
      Therefore,
      ∠BAC = 90 - 40 = 50°
      Now, in triangle ABC,
      ∠BCA = 180 - (50 + X) = (130 - X)°
      Now,
      AD || FE and BC is transversal line. So,
      ∠CBE = ∠BCA [alternate interior angles]
      70 = 130 - X
      X = 130 - 70
      X = 60°

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