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.

Point B i

In this movie we move point B along a line parallel to AC (AC is the invariant line of the shear).

We pause at two salient postitions that we label B1 and B2.
The movie then reverses and hides the two points again.
You might ask
- Can you remember the position of the two points?
- What is special about the points?
- Are there other such points?

On the next page we show the same movie but with the resulting base and height of triangle ABC highlighted for the two positions of B.