Tessellations of Pentagons: Hands-On Activity #4 (large image)
Practice the Third Pentagon Technique (Easy) --- Totally Tessellated @ http://library.advanced.org/16661/
Instructions: Print this page and then close this window. Repeat the pattern as shown. The dotted line indicates the side of the original triangle that produced the two new sides. Don't forget that this is still a tessellation of pentagons!