Law of tangents

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Fig. 1 - A triangle.

In trigonometry, the law of tangents is a statement about arbitrary triangles in the plane.

In Figure 1, a, b, and c are the lengths of the three sides of the triangle, and α, β, and γ are the angles opposite those three respective sides. The law of tangents states that

[\frac = \frac(alpha-beta)]}(alpha+beta)]}.]

See also

• Law of sines
• Law of cosines

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