Lesson 11
Rectangles with the Same Perimeter
Lesson Purpose
Lesson Narrative
In previous lessons, students learned to find the area and perimeter of rectangles. In this lesson, students draw rectangles with a specified perimeter, find their areas, and notice that rectangles with the same perimeter do not always have the same area. Students then draw rectangles with specific perimeter that have different areas.
- Engagement
- MLR8
Activity 2: Same Perimeter, Different Area
Learning Goals
Teacher Facing
- Draw rectangles with the same perimeter and different areas.
Student Facing
- Let’s explore rectangles with the same perimeter.
Required Preparation
Activity 2:
- Create 4 visual displays. Each visual display should be labeled with a different perimeter. Use the following perimeters: 12 units, 20 units, 26 units, 34 units).
- Students cut out and tape their rectangles on one of the visual displays during this activity.
Lesson Timeline
| Warm-up | 10 min |
| Activity 1 | 15 min |
| Activity 2 | 20 min |
| Lesson Synthesis | 10 min |
| Cool-down | 5 min |
Teacher Reflection Questions
Who has been sharing their ideas in class lately? Make a note of students whose ideas have not been featured in class and look for an opportunity for them to share their thinking in tomorrow’s lesson.
Suggested Centers
- Can You Draw It? (1–5), Stage 4: Area and Perimeter (Addressing)
Print Formatted Materials
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| Student Task Statements | docx | |
| Lesson Cover Page | docx | |
| Cool Down | Log In | |
| Teacher Guide | Log In | |
| Teacher Presentation Materials | docx | |
| Blackline Masters | zip |