The perimeter of a shape is the length of its boundary.
Think of an ant starting from one corner of a small box, measuring 3 cm by 4cm. Imagine it walks all the way around the edge of the box. What distance will it have walked?
Perimeter = 4 + 3 + 4 + 3 = 14 cm
When calculating the perimeter, remember to include the length of every side.
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