Do you mean you know the lengths of the sides but you don't know the size
of any of the angles ?
If that's the situation, then yes. The lengths of the sides tell you everything
about the triangle, and they define one and only one unique triangle. With
a little bit of trig, you can figure out what the size of each angle has to be.
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Thats already a triangle if it three sides.
A scalene triangle can be the size of a mosquito or the size of a city. The only thing you know about it is that no two of its sides are equal. If you only know that it's a scalene triangle, then there's no way to know how long any of its sides is.
A triangle can have only three sides. No triangle can have 9 sides!
By using trigonometry
Its not a triangle if it has only two sides.