2, knowing the two sides and the included angle, using the cosine theorem, the unique solution;

3. Given two angles and an edge, the unique solution is obtained by sine theorem;

4. Given two sides and diagonal lines, use sine theorem. Called a, b, a

( 1)

(2) The unique solution when a = bsinA;

(3) When BSINA

(4) Unique solution when a ≥ b.