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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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