No because in order to construct a triangle the sum of its 2 smaller sides must be greater than its longest side.
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No
Yes, it is possible.
Since there is no triangle "below", all that can be said is that EF - if it is the third side of the triangle - is any length in the interval (24, 54).
The dimensions of the scalene triangle could be 7 by 5 by 3 inches
If all 3 sides each have a length of 15½ inches, it would be called an Equilateral Triangle