  By "solving a triangle", one refers to determining the three sidelengths and
the three angles, based on given information.Depending on the specific
information, one or more triangles may satisfy the requirements of the given
information.In the SAS case, two of sidelengths are given, as well as the angle
contained by the two sides.According to Euclidean Geometry, such a triangle
must be unique. In reference [1], and pretty much in standard trigonometry and
precalculus texts,the Law of Cosines is employed in solving a SAS triangle. In
this work we use an alternative approach by using the Law of Cosines.In Section
2, we list some basic trigonometric identities and in Section 3 we prove a
lemma which is used in Section4. In Section4, we demonstrate the use of the Law
of Sines in solving an SAS triangle. In Section 5 we offer three examples in
detail; the last one being more general in nature.

General Mathematics