Lesson objective: Apply knowledge of surface area to create pyramids with limited surface area.

This lesson provides an opportunity for students to apply their knowledge and understanding of surface area to a real-life situation. Students are asked to design two pyramid shaped boxes that use less cardboard than octagonal prism box, while still being large enought to fit a game board.

Key Concept students will use:

- Surface area and volume have the same meaning for non-rectangular prisms and pyramids as for rectangular prisms.

Skills students will use:

- Find the area of polygons by decomposing into triangles and rectangles (Grade 6, Unit 11)
- Use nets to find surface area (Grade 6, Unit 11)

Students engage in Mathematical Practice 7 (Look for and make use of structure) as they find surface area of a given figure and create a new figure within given constraints.

**Key vocabulary: **

- area
- face
- prism
- pyramid
- surface area
- three-dimensional figure
- two-dimensional figure