Lesson objective: Find the area and perimeter of a plane.

This lesson helps to build procedural skill with caluclating the perimeter and area of a plane figure. A rectangle is used here because it provides a predictible process. This work develops students' understanding that perimeter is a linear measure of a shape and can be distinguished from area.

Students engage in Mathematical Practice 4 (model with mathematics) as they demonstrate the area and perimeter of rectangles.

**Key vocabulary:**

- perimeter
- area
- length
- width