Lesson objective: Solve problems that require students to distinguish between area and perimeter.

This lesson provides an opportunity for students to apply their knowledge and understanding of area and perimeter to a real-life situation. Students are asked to help Mr. Nelson decide which pool to buy.

Key Concept students will use:

- perimeter is a linear attribute of plane figures and can be distinguished from area

Skills students will use:

- finding area of a figure (Grade 3, Unit 2)
- finding the perimeter of a figure (Grade 3, Unit 3)

Students engage in Mathematical Practice 1 (make sense of problems and persevere in solving them) as they determine whether the concept of area or perimeter applies, and then calculate those measures.

**Key vocabulary: **

- area
- perimeter
- length
- width