In this chapter, you will get tips on all things measurement—perimeter, area of polygons, and volume. I will cover the formulas needed to solve problems and a few shortcuts that I use with students in my classroom. At the end of this chapter, I have included a list of the formulas for your reference.

*Perimeter* is the distance around a shape. The distance around the shape is measured in units of length—inches (in), feet (ft), yards (yd), meters (m), etc. In my classroom, I relate perimeter to being like the “fence” around the object, since it is the distance around a shape. To find the perimeter, add the lengths of all the sides. Then name the unit of length used to measure the sides.

**Examples**

**Rectangle**

The lines ...

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