ACOS

• Source: https://www.freebasic.net/wiki/wikka.php?wakka=KeyPgAcos
• Last revised: 2018-04-16

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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.

Examples

start GeSHi

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

end GeSHi

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

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