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# What is atan() in Dart?

harris910

The atan() function returns the inverse tangent of a number. To be more specific, it returns the inverse tangent of a number in radians.

Figure 1 shows the mathematical representation of the atan() function:

Figure 1: Mathematical representation of inverse tangent function

Note: dart:math is required for this function.

To convert radians to degrees, use the following formula:

degrees = radians * ( 180.0 / pi )


### Syntax

double atan(double num)


### Parameter

This function requires a number as a parameter.

### Return value

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

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

### Example

import 'dart:convert';
import 'dart:math';
void main() {
print("The value of atan(0.5): ${atan(0.5)} Radians"); // negative number in radians print("The value of atan(-0.5):${atan(-0.5)} Radians");

//applying acos() and then converting the result in radians to degrees
// PI = 3.14159265
double result=atan(1.0) * (180.0 / pi);
print("The value of atan(1.0): \${result} Degrees");
}

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atan
math
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