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.

**Then shear N**

Here shear *N* (with a slanting invariant line through D) is applied to the image of square ABCD (ie after shear *M*).

The resulting image is a rectangle. What can you say about its dimensions and its area?

How far has point B' (the first image of B) moved under shear *N*?

What is the distance of B' from the invariant line *n*?

So what is the *shear factor* for shear *N*?

You can explore the shear further using this JAVA worksheet: JAVA-shear-N.

The movie on the next page combines the first two movies, ie it shows the effect of *M* followed by *N*.