Java Math atan2()

The syntax of the atan2() method is:

Math.atan2(double y, double x)

Here, atan2() is a static method. Hence, we are accessing the method using the class name, Math.

atan2() Parameters

The atan2() method takes two parameters.

• x/y - rectangular coordinates x and y

Note: The coordinates x and y represent a point in a two-dimensional plane.

atan2() Return Values

• returns angle θ by converting coordinates (x, y) to coordinates (r, θ)

Example: Java Math.atan2()

class Main {
  public static void main(String[] args) {

    // two coordinates x and y
    double x = 3.7;
    double y = 6.45;

    // get angle θ
    double theta = Math.atan2(y, x);
    System.out.println(theta);                   // 1.0499821573815171

    // convert into the degree
    System.out.println(Math.toDegrees(theta));    // 60.15954618200191
  }
}

Here, the atan2() method converts the coordinates (x, y) to coordinates (r, θ) and returns the angle theta (θ).

We have used the Math.toDegrees() method to convert the angle θ into the degree.