How do I call the first area method from the main method?

I need the area method that contains the formula for the area of a circle to take in the radius that was found by the other area method that calculated the distance...So one of the area methods calculated the distance/radius then I want that answer to be used in the the radius of the area method for the area of a circle.

public static void main(String[] args) {

    Scanner reader = new Scanner (System.in);

    double x1, x2, y1, y2;

    System.out.println("x1: ");
        x1 = reader.nextInt();
    System.out.println("x2: ");
        x2 = reader.nextInt();
    System.out.println("y1: ");
        y1 = reader.nextInt();
    System.out.println("y2: ");
        y2 = reader.nextInt();

    double distance = area(x1, x2, y1, y2);

    System.out.println(distance);

    double radius = area();

    System.out.println(radius);


}

public static double area (double radius) {
    double areaCircle;
    double powRadius;
    double radius = 1; //PLACEHOLDER


    powRadius = Math.pow(radius, 2);
    areaCircle = (Math.PI *(powRadius));
    return areaCircle;


}
public static double area (double x1, double x2, double y1, double y2) {
    double dx = x2 - x1;
    double dy = y2 - y1;
    double dsquared = dx*dx + dy*dy;
    double distance = Math.sqrt (dsquared);
    return distance;
}