Last modified: June 17, 2011
Applies to: Office 2013 | Visio 2013
In this article Syntax Remarks Example
Returns the arccosine of number, for example, the angle whose cosine is number.
ACOS(number)
The input value must be in the range -1 <= number <= 1, or a #NUM! error is returned. The resulting angle is in the range 0 <= angle <= PI radians (0 <= angle <= 180 degrees).
ACOS(0)
Returns 90 deg