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      Question

      The condition for the line y = mx + c to be tangent to

      the circle  x ²  + y ²  = r ²  is 
      A c = mr Correct Answer Incorrect Answer
      B m² + c² = r² Correct Answer Incorrect Answer
      C c² = m²(1 – r²) Correct Answer Incorrect Answer
      D c² = m²(1 + r²) Correct Answer Incorrect Answer

      Solution

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