Excel: ACos Function

In Excel, the ACos function returns the arccosine (in radians) of a number.

The syntax for the ACos function is:

ACos( number )

number is a number between -1 and 1. It is the cosine of the angle that you wish to find.

Applies To:

For example:

Let's take a look at an example:

Based on the Excel spreadsheet above:

=ACos(A1) would return 2.498091545

=ACos(A2) would return 1.570796327

=ACos(A3) would return 0.722734248

=ACos(0.2) would return 1.369438406