Which of the following pair of lines in a circle cannot be parallel?

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Question:

Which of the following pair of lines in a circle cannot be parallel?  

(a) two chords
(b) a chord and a tangent
(c) two tangents
(d) two diameters

 

Solution:

Two diameters cannot be parallel as they perpendicularly bisect each other.
Hence, the correct answer is option (d)

 

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