Input area to generate shape

I want to write a code that plots a specific shape given an input for an area. How do I do this for different areas while being able to scale the size of the shape?

[José-Luis]

What have you tried so far?

[Image Analyst]

You're not being very specific. What are the shapes?

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer