Acos
Purpose
Returns the arccosine (Acos), or inverse cosine, of a number.
Format
Acos (number)
Parameters
number - any numeric
expression or
field containing a numeric expression in the range -1 to 1
Data type returned
number
Originated in
FileMaker Pro 9.0
Description
The arccosine is the angle whose cosine is number. The returned angle is given in radians in the range 0 (zero) to Pi. The input number parameter must be between -1 and 1.
If you want to convert the result from radians to degrees, multiply it by 180/Pi or use the
Degrees function.
Examples
Acos(-0.5) returns 2.0943951.
Acos(-0.5)*180/Pi returns 120.
Degrees(Acos(-0.5)) returns 120.
Acos(2.0)returns ? (not a number).
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