Students were challenged to make the 12 Sonobe units required for the Octahedron or 24 - sided figure. They then had to put together four pyramids using 3 Sonobe units, and finally attach all four pyramids together to make the total figure. Once they completed the figure, it was used to answer questions on the 24 - sided Figure sheet.
Students had to count the faces, edges and vertices. They had to determine concave from convex edges. They had to calculate the surface area of one of the triangular faces using the formula: A = 1/2(bh), then use that information to calculate the total surface area. They had to develop a strategy for being sure they had counted all faces, edges and vertices. Overall, it was a very fun way to teach and review math skills!
Students had to count the faces, edges and vertices. They had to determine concave from convex edges. They had to calculate the surface area of one of the triangular faces using the formula: A = 1/2(bh), then use that information to calculate the total surface area. They had to develop a strategy for being sure they had counted all faces, edges and vertices. Overall, it was a very fun way to teach and review math skills!