Why my code error? (Project 5)

Question

class Square extends Shape {
public int area2;
public Square (int x)
{
width =x;

}
public void area()
{
area2 =width*width;
System.out.println (area2 );

}
}
class Circle extends Shape {
public double area1;
public Circle (int y)
{
width =y;
}
public void area()
{
area1 =Math.pI*width*width;
System .out .println (area1);
}
}

Answer 1

Yeah u missing Shape class

Answer 2

Sorry I couldn't clear this code

Answer 3

Where is the Shape class.