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Perimeter Resources
Perimeter is another geometric concept that your child will begin learning in third grade. Perimeter is defined as the distance around a twodimensional shape. Calculating perimeter requires addition and multiplication skills, so after your student has mastered those concepts, you can help them move on to our worksheet resources for perimeter.
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Perimeter Basics
Perimeter is the total length around a shape, and for different shapes, there are different ways to calculate it. Square: perimeter = 4 × s, where s is the length of a side
 Rectangle: perimeter = 2 × (w + h), where w is width and h is height
 Triangle: perimeter = a + b + c, where a, b, and c are the lengths of three different sides
 Circle: the perimeter for a circle is actually called the circumference. Circumference = 2 × Ï€ × r, where r is the radius.
 Quadrilateral: perimeter = a + b + c + d, where a, b, c, and d are lengths of different sides
After you practice your perimeter skills with the resources on this page, you can then move over to our area resources to learn how to calculate the amount of space inside a shape.