**Georgia Performance Standards (GPS – 5th grade)**

M5M2. Students will extend their understanding of perimeter to include circumference: (a) Derive the formula for the circumference of a circle. (b) Find the circumference of a circle using the formula and pi ≈ 3.14.

**National Council for Teachers of Mathematics (NCTM – grades 3–5): **

Explore what happens to measurements of a two-dimensional shape such as its perimeter and area when the shape is changed in some way.

*Note that standards in this lesson plan are for example only. This lesson can be easily adapted to meet your state’s specific standards.*