public class Sirkel extends Form {
    private double radius;

    public Sirkel(String farge, double radius) {
        super(farge);
        this.radius = radius;
    }

    @Override
    public double areal() {
        return 3.14 * radius * radius;
    }

     @Override
    public String toString() {
        return "Type: Sirkel, " + super.toString() + " areal: " + areal(); 
    }
}