ACOS Function

Office 2013 and later

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

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