program in C#

In this project, you are going to exercise the "design and development process" through the design and development of some shapes classes, such as Rectangle, Circle, and Triangle. Assuming the purpose of this project is to teach kids about some essential concepts of shapes, including what basic elements of each shape and how to calculate areas, etc. Using GUI is encoraged. Recall the process: 1. Understand the problem Decide classes needed 3. UML Design 4. Think again: How do the modules (classes) solve the problem? What does the driver need to do? Are the members enough? etc. 5. Develop the code for each class 6. Develop the driver