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# What is atan() in Perl?

harris910

The atan() function (also called the arc tangent function) returns the inverse tangent of a number.

To be more specific, it returns the inverse tangent of a number in radians.

Figure 1 below shows the mathematical representation of the atan() function.

Figure 1: Mathematical representation of inverse tangent function

Figure 2 shows the visual representation of the atan() function.

Figure 2: Visual representation of inverse tangent function

### Methodology

To convert radians to degrees, use the following function.

rad2deg(angleInRadians)


### Syntax

atan(num)


### Parameter

This function requires a number as a parameter.

### Return value

atan() will return the inverse tangent of a number (in radians) that is sent as a parameter.

The return value lies in the interval of [-pi/2,pi/2] radians.

### Code

#this header for rad2deg() function
use Math::Trig;

$a = atan(0.5); print "atan(0.5):$a Radians\n";

$b = atan(-0.5); print "atan(-0.5):$b Radians\n";

#applying atan() and then converting the result in radians to degrees
$c = rad2deg(atan(1.0)); print "atan(1.0):$c Degrees\n";


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