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Look at the length of the polygon's sides to determine if it's irregular. Write down the length of each side of the polygon. Add up all of the lengths to find the perimeter.
An irregular polygon is a polygon that doesn't have equal sides. If the sides of the polygon are all the same length, that means the polygon is regular, not irregular. Since not all sides of an irregular polygon are equal, you'll need to write out each individual side length. Even if some of the sides are equal, you should still write each length out individually. For example, if you're working with a rectangle that has 2 sides that are 4 units long and 2 sides that are 3 units long, you would write "4, 4, 3, 3." If you're working with an irregular polygon that has 1 side that's 2 units, 1 side that's 3 units, and 1 side that's 4 units, you would write "2, 3, 4." To find the perimeter of an irregular polygon, all you need to do is find the total of all of its side lengths. Simply add up each side length that you wrote down to find the perimeter of the polygon! For example, if the side lengths for the polygon were 4, 4, 3, and 3, they would add up to 14. Therefore, 14 would be the perimeter of the polygon.