Demonstrate toDegrees() and toRadians(). : Math Functions « Development « Java Tutorial

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class Angles {
  public static void main(String args[]) {
    double theta = 120.0;

    System.out.println(theta + " degrees is " + Math.toRadians(theta) + " radians.");

    theta = 1.312;
    System.out.println(theta + " radians is " + Math.toDegrees(theta) + " degrees.");
  }
}