# Inverse Secant Calculator arcsec(x)

Written by:
PK

Here is an inverse secant calculator (or arcsec calculator), which calculates an angle from the ratio from the secant function. Enter a result and choose to return radians or degrees, then compute the angle.

## Using the Arcsecant Calculator

To use the tool to find the angle from a known secant, enter the ratio and the units you'd like and compute.

• Secant - ratio of the longest side to the adjacent side
• Output Degrees or Radians? - choose to return degrees or radians

Once you're happy, click the "Compute Arccsc" button.

• Angle - the input angle to get the secant entered

## What is the arcsecant or inverse secant?

Arcsecant is the inverse of the secant, which is the ratio of the hypotenuse, or longest side, to the adjacent side in a right triangle.

The hypotenuse is the longest side which constrains the arcsecant. A valid secant must be less than or equal to -1, or greater than or equal to 1.

### Arcsecant as a formula

Inverse secant is usually abbreviated as "arcsec" or "asec", as in the following equation:

arcsec(y)=asec(y)

Where it is the inverse of secant, or:

x=arcsec(y)\\y=sec(x)

Next, see all the inverse trigonometric functions or trigonometric functions in one tool.

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