# Law of Sines

**Triangulation **is the method of measuring remaining sides and/or angles of a triangle given partial information about some sides/angles of the triangle. The **law of sines **is useful when the partial specification is in the form of AAS, ASA, SSA. The first two specifications define a unique triangle. However, the last case has between 0 to 2 multiple answers, depending on the given information. It can be shown that the common value of three ratios considered in the law of sines is the diameter of the circumcircle of the triangle.

**Review**: Properties of similar triangles, solving equations of proportions

**Learning Objectives:**

- Law of Sines