// TODO - write your code below this comment.
// You need to do the following:
//
// 1.) Define a class named CircleDynamicArea.
//     This class inherits from Circle.
//
// 2.) Define a constructor which takes a double
//     to initialize the superclass with.
//     You'll need to use super.
//
// 3.) Define a getArea instance method, which
//     returns the area of the circle calculated
//     from the current radius of the circle.
//     This can be determined from this expression:
//
//     Math.PI * (getRadius() * getRadius())
//