This Problem Set is a part of the Lesson 15, Unit 5, Grade 6. Students construct three-dimensional figures through the use of nets. For Grade 6, specifically in this lesson, the working description of a net is this: If the surface of a three-dimensional solid can be cut along enough edges so that the faces can be placed in one plane to form a connected figure, then the resulting system of faces is called a net of the solid. A more student-friendly description used for this lesson is the following: Nets are two-dimensional figures that can be folded to create three-dimensional solids.