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Q 1720223111.     Suppose `ABC` is a triangle with `AB` of unit length.
`D` and `E` are the points lying on `AB` and `AC`
respectively; such that `BC` and `DE` are parallel. If
the area of `DeltaABC` is twice the area of `DeltaADE`, then
the length of `AD` is
(Provided By a Student and Checked/Corrected by EXXAMM.com Team)