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# Atn Function

Trigonometric function that returns the arctangent of a numeric expression. The return value is in the range -Pi/2 to +Pi/2.

The arctangent is the inverse of the tangent function. The Atn Function returns the angle "Alpha", expressed in radians, using the tangent of this angle. The function can also return the angle "Alpha" by comparing the ratio of the length of the side that is opposite of the angle to the length of the side that is adjacent to the angle in a right-angled triangle.

Atn(side opposite the angle/side adjacent to angle)= Alpha

## தொடரமைப்பு:

    Atn (Number)

## Return value:

Double

## அளவுருக்கள்:

Number: Any numerical expression that represents the ratio of two sides of a right triangle. The Atn function returns the corresponding angle in radians (arctangent).

To convert radians to degrees, multiply radians by 180/pi.

degree=(radian*180)/pi

radian=(degree*pi)/180

Pi is here the fixed circle constant with the rounded value 3.14159.

## பிழையான குறியீடுகள்:

5 செல்லாத செயல்முறை அழைப்பு

## எடுத்துக்காட்டு:

    ' The following example calculates for a right-angled triangle

    ' the angle Alpha from the tangent of the angle Alpha:

    Sub ExampleAtn

    ' rounded Pi = 3.14159 Is a predefined constant

    Dim d1 As Double

    Dim d2 As Double

        d1 = InputBox("Enter the length of the side adjacent to the angle: ","Adjacent")

        d2 = InputBox("Enter the length of the side opposite the angle: ","Opposite")

        Print "The Alpha angle is"; (atn (d2/d1) * 180 / Pi); " degrees"

    End Sub