Tangent of Supplementary Angle

Theorem

 * $\tan \left({\pi - \theta}\right) = -\tan \theta$

where $\tan$ denotes tangent.

That is, the tangent of an angle is the negative of its supplement.

Also see

 * Sine of Supplementary Angle
 * Cosine of Supplementary Angle
 * Cotangent of Supplementary Angle
 * Secant of Supplementary Angle
 * Cosecant of Supplementary Angle