Returns the arccosine, or inverse cosine, of a number. The arccosine is the angle whose cosine is number. The returned angle is given in radians in the range 0 (zero) to
Using the ACOS function
The ACOS function returns the inverse cosine of a value. Input to the arc-cosine function must be between -1 and 1, inclusive. Geometrically, given the ratio of a triangle’s adjacent side over its hypotenuse, the function returns the angle of the triangle. For example, given a ratio of 0.5, the function returns an angle of 1.047 radians.
Syntax
= ACOS(number)
number – The cosine value for which you want to calculate the arccosine
Note: the results will be returned as radians. To return a degree, use the DEGREES function like so:
= DEGREES(ACOS(number))