Move around the outside of the shape and cross off the sides as you add them if they are simple enough for your child to add. I recommend that to avoid this mistake, you could teach the child to pick a corner to start at. To find the perimeter of this irregular triangle, we add up the three side lengths.Ī tip for teaching perimeter of irregular shapes is to cross off each side length as you have added it.Ī common mistake for children calculating perimeter is that they miss a side out completely or count a side more than once. Here is an example of finding the perimeter of an irregular triangle: To calculate the perimeter of a shape, we add the lengths of each side. The perimeter of a shape is the total distance around its outside edges. However, a shape is irregular if it has at least one side that is of a different length to any of the other sides.įor example, a triangle can have two sides that are the same, but just one side that is different to the other two sides and it is an irregular shape.īelow are some examples of irregular shapes. People sometimes think that for a shape to be irregular, all of its sides have to be different to each other. When teaching irregular shapes it is important to be aware of a common mistake. Since the number of corners a shape has is the same as the number of its sides, we can also name a shape by how many corners it has.īelow are some common examples of irregular shapes arranged in a list with their properties shown. We name irregular shapes based on how many sides they have. An irregular shape is any shape that is not regular. All of its angles will also be the same size.Īn irregular shape is simply any shape where not all of the side lengths and angles are the same. In this lesson we will look at some examples of irregular shapes and learn how to calculate their perimeters.Ī regular shape is a shape in which every side is the same length. To find the perimeter of an irregular shape you simply add up the outer side lengths of the shape.
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