i am pretty sure it's perimeter but I'm not to sure
Yes, it is perimeter, and if the figure is circular, it is also the circumference.
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The distance around a closed plane figure is called the perimeter. The perimeter of a figure can be calculated by adding together the lengths of each side.
It is called perimeter.
The distance round a closed figure is the perimeter.
Perimeter
It means you have found the distance around that figure.