What is Secant Equal to?
Answer – Secant, or sec, equals the inverse of cosine.
Explanation:
The secant of an angle of a right triangle is found using any of these two methods:
1. Find the cosine of the angle. Then, find its reciprocal.
2. Calculate the ratio of the hypotenuse to the side adjacent to the angle.
In the above triangle, cos A is the ratio of the adjacent side c to the hypotenuse b.
Sec A would then be the reciprocal of this—the ratio of the hypotenuse b to the adjacent side c.
