Fostering spatial reasoning is an important step in understanding 2-D and 3-D geometry. In this 2-day lesson, students will build models of 2-D and 3-D shapes to determine relationships between area and volume. Click on the image to access the Keynote slide deck. (You will need to open the file in Keynote to view the document.) A full lesson plan that includes expectations and learning goals, prompts, and required materials can be found here.