In models/shape.py

Add two methods to Shape: area(self) and perimeter(self). Both should return 0 as default values (to be overridden by subclasses).

In models/circle.py

Create a Circle class that inherits from Shape. Its __init__(self, radius) should call the parent constructor with name "Circle" and set the radius attribute.

In models/circle.py

Override Circle's area(self) and perimeter(self) methods. Use math.pi for calculations.

• Area: π × radius²
• Perimeter (circumference): 2 × π × radius

In models/rectangle.py

Create a Rectangle class that inherits from Shape. Its __init__(self, width, height) should call the parent constructor with name "Rectangle" and set width and height attributes.

In models/rectangle.py

Override Rectangle's area(self) and perimeter(self) methods.

• Area: width × height
• Perimeter: 2 × (width + height)

In collection.py

Create a ShapeCollection class with:

• __init__(self, shapes) - takes a list of Shape objects
• total_area(self) - returns the sum of all shape areas
• largest_shape(self) - returns the shape with the largest area