Triangles Everywhere: Sum of Angles in Polygons

Each group needs:

• pencils and blank paper
• ruler or straightedge
• protractors
• KWL Chart (PDF), one per student
• Sum of Angles in Polygons Worksheet (PDF), one per student

To share with the entire class:

• some example photographs and diagrams of truss designs, bridges and other truss structures to show the class (digital or hardcopy); search online for “truss bridge” images; look at NCDOT’s images of truss bridge designs at https://www.ncdot.gov/initiatives-policies/Transportation/bridges/historic-bridges/bridge-types/Pages/truss.aspx