Measure each side of the five sides of the pentagon. For example, suppose the five sides measure 2 inches, 3 inches, 4 inches, 3 inches and 2.5 inches.
How to Find the Perimeter of a Pentagon
Looking for the perimeter of a pentagon requires you to focus on the outside of the shape and not what it contains. A pentagon is a polygon, which is a closed twodimensional shape constructed from straight lines. A polygon can be regular, which means each of its sides measures the same, or irregular, where the sides are different lengths. A polygon's perimeter  the combined length of its sides  measures its borders. You can find the perimeter of both regular and irregular polygons through individual measurements combined with simple math.
Things You'll Need
 Ruler
Instructions


1

2
Add the lengths of the five sides together. In this example, the sum of the five sides equals 14.5 inches.


3
Multiply the length of one side by 5 if the pentagon is a regular pentagon. For an example, multiplying a side length of 3 inches by 5 equals 15 inches.

1

References
Resources
 Photo Credit Digital Vision./Photodisc/Getty Images