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Perimeter

Definition

Definition Perimeter

The perimeter of a shape is the total length around its outside edge.

To find the perimeter, imagine walking around the shape like it’s a park. Count the number of unit lengths along each side as you go.

Example

Find the perimeter of the red shape:

To find the perimeter, we add the length of all 4 sides : 2 + 2 + 2 + 2.
The perimeter is 8 units.