Definition of

Secant (function)

Secant (function)

In a right angled triangle, the secant of an angle is:

The length of the hypotenuse divided by the length of the adjacent side.

The abbreviation is sec

sec(θ) = hypotenuse / adjacent

It is not commonly used, and is equal to 1/cosine

../geometry/images/triangle-q.js?mode=sec