Acos
Finds the arccosine of an angle
Syntax
`
Declare Function Acos ( ByVal number As Double ) As Double
`
Usage
`
result = Acos( number )
`
Parameters
`number`
A cosine value in the range [-1..1].
Return Value
The arccosine of `number`, in radians, in the range [0..Pi].
Description
`Acos` returns the arccosine of the argument `number` as a `Double` within the range of 0 to Pi. The arccosine is the inverse of the `Cos` function. The returned angle is measured in radians (not degrees).
`Acos` can be overloaded as operator to accept user-defined types.
Example
`
Dim h As Double
Dim a As Double
Input "Please enter the length of the hypotenuse of a triangle: ", h
Input "Please enter the length of the adjacent side of the triangle: ", a
Print ""
Print "The angle between the sides is"; Acos ( a / h )
Sleep
`
The output would look like:

    Please enter the length of the hypotenuse of a triangle: 5
    Please enter the length of the adjacent side of the triangle: 4

    The angle between the sides is 0.6435011087932843

Dialect Differences

- Not available in the -lang qb dialect unless referenced with the alias `__Acos`.

Differences from QB

- New to FreeBASIC

See also

- `Cos`
- A Brief Introduction To Trigonometry