Double-click on the movie to PLAY.

Click once to PAUSE.

Double-click again to return to the START of the movie.

M0

This movie animates the diagram in quite a constrained way.

In the initial configuration the triangles are congruent.

As the squares gets closer together the two triangles both get smaller and smaller.

Are the areas of the two triangles always equal?

We explore this conjecture on the next page.