What is this lesson about Students will use squares (these could be square tiles or Triqo pieces) to discover pentominoes (shapes created by joining 5 squares along an edge). The students then use Triqo squares to determine which squares fold to make open top boxes. Note this lesson may involve several ses- sions. The first would involve finding all the pentominoes and the second would involve working out which ones may be folded to create a box without a lid. Australian Curriculum Link The grid above indicates that the lesson is designed to stimulate geometric problem solving and reasoning. Specifically this lesson would fit the following content from the Australian Cur- riculum. ACMMG111: Connect three-dimensional objects with their nets and other two-dimen- sional representations. Elaborations • identifying the shape and relative position of each face of a solid to determine the net of the solid, including that of prisms and pyramids • representing two-dimensional shapes such as photographs, sketches and images created by digital technologies Bring 2D to life with tr iq o Assessment National tests such as the NAPLAN often contain pictures of 2D nets (the flat shape that may be folded to make a 3D object) and students are asked to visualize which net folds to make a cube. Some questions even ask the student to visualize which face will be opposite another when the net is folded to make a cube. Hannah folds this net to make a cube. Which face is opposite face C (orange)? A B C D F E F U I V L W N X P Y T Z 1 triqo leskaart 01-w.indd 1 23-08-12 10:02