java.lang.Math.atan2() in Java

atan2() is an inbuilt method in Java which is used to return the theta component from polar coordinate. The atan2() method returns a numeric value between – $\pi$ and $\pi$ representing the angle $\theta$ of a (x, y) point and positive x-axis. It is the counterclockwise angle, measured in radian, between the positive X-axis, and the point (x, y).

Syntax :

Math.atan2(double y, double x)
where, x and y are X and Y coordinates in double data type.

Returns :
It returns a double value. The double value is $\theta$ from polar coordinate (r, theta).

Example : Program demonstrating the atan2() method

// Java program for implementation of 
// atan2() method 
import java.util.*; 
class GFG { 
  
    // Driver Code 
    public static void main(String args[]) 
    { 
  
        // X and Y coordinates 
        double x = 90.0; 
        double y = 15.0; 
  
        // theta value from polar coordinate (r, theta) 
        double theta = Math.atan2(x, y); 
  
        System.out.println(theta); 
    } 
} 

Output :

1.4056476493802699

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