This is a simple example of a program that uses the htdp-image library.
The Tromino Tiling problem is commonly introduced to students learning induction. An interesting fact about the problem is that its proof also gives us a program for solving an instance of the tromino tiling problem. This program demonstrate an example solution where the solution mimics the logic behind the inductive proof, but without worrying about the graphics side of the program at all!
tromino-tile 5 25 25
tromino-tile 3 2 6