This Instructional Activity is a part of the Lesson 9, Unit 5, Grade 8. Students work independently or in pairs to complete Exercises 1-4. Once students are finished, debrief the activity. Ask students to think about real-life situations that might require using the function they developed in Exercise 4. Some sample responses may include area of wood needed to make a -inch frame for a picture, area required to make a sidewalk border around a park or playground, or the area of a planter around a tree.