On this page is a *secant calculator*. Input an angle's measurement, choose your units, and run the calculator to see the secant.

## Secant Calculator for Angles or Radians

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## Using the Secant Calculator

To use the tool to find the secant, enter the measurement of the angle in either degrees or radians, choose your units, and compute.

**Angle**- measurement of the angle, in degrees or radians**Degrees or Radians?**- choose your units in the menu

Once happy, click the "Compute Secant" button.

**Secant**- the secant, or ratio of the hypotenuse over the adjacent side's measurement

## What is the secant?

For a given angle in a right triangle, secant is the ratio of the longest side (the *hypotenuse*) to the adjacent side. Secant is the reciprocal of the cosine; cosine is the ratio of the adjacent side's length to the hypotenuse.

Trigonometric functions such as the secant are also used to find the ratio between sides of a unit circle (a circle with radius 1).

### Secant as a formula

Secant is usually abbreviated as "sec" as a trigonometry formula, as in the following equation:

\sec(\theta)

As the reciprocal of cosine, it's equivalent to:

\sec(\theta)=\frac{1}{\cos(\theta)}

If you already have the secant ratio, you can use the inverse secant or arcsecant to find the angle.