1. Identify the problems in the code below

public class Circle {

private double radius;

public Circle(double radius) {

radius = radius;

}

public double getRadius() {

return radius;

}

public double getArea() {

return radius*radius*Math.PI;

}

}

class B extends Circle {

private double length;

B(double radius, double len) {

Circle(radius);

length = len;

}

@override

public double getArea() {

return getArea() * length;

}

}