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[" Square "ABCD" of diagonal "2a" is fol...

[" Square "ABCD" of diagonal "2a" is folded along the diagonal "AC" so that the "1],[" angle.The shortest distance between "DC" and "AB" is "],[[" (a) "sqrt(2)a," (b) "2a/sqrt(3)],[" (c) "2a/sqrt(5)," (d) "(sqrt(3)/2)a]]

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