which of the following pairs of lines in a circle cannot be parallel ?
(a) Two chords (b) A chord and a tangent
(c) Two tangents (d) Two diameters
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Solution
(d) Two diameters.
All the other pairs can be parallel, but for a diameter to be parallel with another diameter it has to be the same diameter, so there is no pair. Hence two diameters can not be parallel in a circle.