ACOS
Applies to: 
Calculated column
Calculated table
Measure
Visual calculation
Returns the arccosine, or inverse cosine, of a number. The arccosine is the angle whose cosine isnumber. The returned angle is given in radians in the range 0 (zero) to pi.
Syntax
ACOS(number)
Parameters
| Term | Definition |
|---|---|
Number |
The cosine of the angle you want and must be from -1 to 1. |
Return value
Returns the arccosine, or inverse cosine, of a number.
Remarks
If you want to convert the result from radians to degrees, multiply it by 180/PI() or use the DEGREES function.
Example
| Formula | Description | Result |
|---|---|---|
= ACOS(-0.5) |
Arccosine of -0.5 in radians, 2*pi/3. | 2.094395102 |
= ACOS(-0.5)*180/PI() |
Arccosine of -0.5 in degrees. | 120 |