http://www.mathedpage.org/constructions/sum/index.html
Some rights reserved

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

Sum of the Angles in a Triangle

by Henri Picciotto

You can move the red dots.

Download the Cabri file.
If you make a GSP version of this, send it to me and I'll post it here.

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