This is the third of four project-based lessons in which students create a robot and an environment for the robot using rectangles and circles. In this lesson, students use the dimensions they determined in Lesson 24 to create the robot's environment. First, they cut out and assemble each object in the robot's environment using grid paper or construction paper. Then they create a line plot of the possible areas for the robot's body and discuss the relationship between area and perimeter of a rectangle.