In this chapter, students transition from two-dimensional shapes to three-dimensional geometry by exploring the concepts of volume and surface area. The primary objective is to help students visualize and calculate the space occupied by various solids, including prisms, pyramids, and spheres. Students will learn to work with composite solids—objects made of multiple shapes—and practice drawing and interpreting "nets," which are flat patterns that fold into 3D objects. By the end of the chapter, learners should be comfortable applying mathematical formulas to solve real-world spatial problems involving complex shapes.