Shapes and method overriding

Write a class Shape and two subclasses of it: Rectangle and Circle.

• new Shape(name) saves name (a string) in the field name.
• The method area() of Shape returns 0.
• describe() of Shape returns the text <name>: area <area>, for example 'Rectangle: area 6'. It takes the area from this.area() and rounds it to 2 digits after the point with Math.round(area * 100) / 100. The number is printed the default JavaScript way: 6, 3.14, 2.5.
• new Rectangle(width, height) creates a shape with the name 'Rectangle'. Its area() returns width * height.
• new Circle(radius) creates a shape with the name 'Circle'. Its area() returns Math.PI * radius * radius, not rounded.
• Rectangle and Circle use method overriding: each one has its own area() method in the class body (not a property set in the constructor).
• Do not write describe() in Rectangle and Circle. They get it from Shape, and for every instance it must show the area of that shape.
• Sizes are numbers, 0 or more.