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Parallelogram Area

by Henri Picciotto

Find a formula for the area of a parallelogram
with vertices (0,0), (a,b), (c,d), and (a+c,b+d)

Use the slider at the top left to see an animation.
parallelogram
For the animation to work, download the Cabri II Plus plug-in,
and use IE in Windows, or Safari on Mac OS X 10.4+.

Download the Cabri file or the Sketchpad file
(no animation in the latter -- if you make an animated sketch, send it to me and I'll post it here)

Visit Henri Picciotto's Math Education Page. Send me e-mail .