Tangent of an angle

the natural tangent of the arc subtending or measuring the angle.

See also: Tangent

References in periodicals archive ?
Abu Dhabi: There's a running joke on the internet about how the school system teaches you how to calculate the sine, cosine, and tangent of an angle (SOHCAHTOA), but fails to teach anything about practical life skills that you actually need.
Maths buffs among you - and I believe Carol Vorderman is a regular reader - will be well aware that Sohcahtoa relates to a mental method to help compute the sine, cosine and tangent of an angle.
Just next to Sheila Wilson turning you down for the spring semi-formal is a tidbit from Geometry I: The tangent of an angle is equal to the rise over the run.