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"Two sides and the angle opposite one of them" doesn't uniquely define a triangle. That is,

there can be two or more triangles with different size, or shape, or area that have the same

two sides and the same angle opposite one of them.

In order to use two sides to define a unique triangle, you also have to give the angle between them.

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Q: Oblique triangle given two sides and an angles opposite one of th em?
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