A

David

Darling

secant

In trigonometry, secant is the ratio of the length of the hypotenuse (the longest side) to the length of the side adjacent to an acute angle in a right-angled triangle. The secant of angle A is usually abbreviated to sec A, and is equal to the reciprocal of its cosine, that is 1 / cos A.

 

A secant is also a straight line that meets a curve in two or more points.