This lesson develops the angle-fold pop-up further. Students predict what will happen when they add a second triangle to the Angle-fold Template. They then explore the directions of motion of the two angle-folds. Next they reverse the triangles and again predict what will happen, before trying it.
For each student:
Scissors, tape, rulers, ballpoint pen, and Post-it™
Outcome: The flags now push towards each other as the book is opened. As with the Monster, the motion is always on the flat side, away from the vertex, which is the pointed tip of the triangle. The two pop-ups look like the two jaws of a mouth.
4. Extensions. Click below to see a video about each of these challenges: