Unit 7, Lesson 12
Rectangles with the Same Area
Grade 3
Preparation
Lesson Narrative
In previous lessons, students learned to find the area and perimeter of rectangles and saw that rectangles with the same perimeter do not always have the same area. In this lesson, students draw rectangles with a specified area, find their perimeters, and notice that rectangles with the same area do not always have the same perimeter. Students then draw rectangles with specific areas that have different perimeters.
- Action and Expression
- MLR8
- Draw rectangles with the same area and different perimeters.
- Let’s explore rectangles with the same area.
Required Preparation
- Create 4 visual displays. Each visual display should be labeled with one of the following areas: 12 square units, 20 square units, 42 square units, 48 square units.
- Students will cut out and tape their rectangles onto one of the visual displays.
Teacher Reflection Questions
How is students’ prior understanding of area informing their understanding of perimeter and area as separate measurements of shapes?