1.

A square ABCD of diagonal 2a is folded along the diagonal 2a so that the planes DAC and BAC are at right angle. The shortest distance between DC and AB is [Kurukshetra CEE 1998]

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A square ABCD of diagonal 2a is folded along the diagonal 2a so that the planes DAC and BAC are at right angle. The shortest distance between DC and AB is
[Kurukshetra CEE 1998]




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