Students will discuss and use the methods for creating congruent triangles. Fast forward to the wooden bridge and play the video to its conclusion with sound. To extend this lesson outside the four walls of the classroom, invite an aerospace engineer, and architect or boat builder to come and talk about design, highlighting how triangles are incorporated into the design. Students could send messages on the internet to other students requesting pictures or descriptions of machines in their environment. The collection could them be sorted for what kind of triangle is used in each machine.
Students build the other shapes on square and circular geoboards.
Students will write a story about themselves as a triangle. They would choose where they would be found, what use they would to people, and their value in the real world.