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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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Q: Can you use Trigonometry if you only know the sides of the triangle?
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