Double-click on the movie to PLAY.

Click once to PAUSE.

RELOAD the page or double-click to return to the START of the movie.

**Static squares**

In this movie, we surround F and A by identical, touching, squares.

We can see that the image of the square around F is a parallelogram, so the image of A will be surrounded by an identical, touching, parallelogram.

[We can thus find the image of A without finding the invariant line and shear factor.]

On the next page we take this approach a step further.