using inheritance write the program for fallowing ?

Question

Hi

This is my thing i have to do ..

Build a  inheritance hierarchy for classes Quadrilateral, Trapezoid, Parallelogram, Rectangle and Square. Use Quadrilateral as the base class of the hierarchy. Create and use a Point class to represent the points in each shape. Make the hierarchy as deep (i.e., as many levels) as possible. Specify the instance variables, properties, and methods for each class. The private instance variables of Quadrilateral should be the x-y coordinate pairs for the four endpoints of the Quadrilateral. Write a program that instantiates objects of your classes and outputs each object's area (except Quadrilateral).

Can anyone help it out .. 

I am totally went wrong when i read this "The private instance variables of Quadrilateral should be the x-y coordinate pairs for the four endpoints of the Quadrilateral"

So help me

Cheers

TY