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

A square \[ABCD\] of diagonal 2a is folded along the diagonal \[AC\] s

1.	A square \[ABCD\] of diagonal 2a is folded along the diagonal \[AC\] so that the planes \[DAC\] and \[BAC\] are at right angle. The shortest distance between \[DC\] and \[AB\] is [Kurukshetra CEE 1998]
A.	\[\sqrt{2}a\]
B.	\[2a/\sqrt{3}\]
C.	\[2a/\sqrt{5}\]
D.	[(\sqrt{3}/2)a\]
Answer» C. \[2a/\sqrt{5}\]

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A square \[ABCD\] of diagonal 2a is folded along the diagonal \[AC\] 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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