It means the distance around something. For polygons, just add the lengths of all the sides.
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The outer boundary of a body or figure.
Oh, dude, the perimeter is just like the fancy math term for the distance around a shape. It's like measuring the border of a figure, you know? So, if you're trying to fence in your garden or something, you gotta calculate that perimeter to know how much fencing you need.
Twice (length + width)
56
the area is 18