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It helps you in real life situations such as how much fencing to put around your yard.
Well, in math you solve the perimeter of circles and such, and learn understanding of them to help you with circles in real life.
Look how many questions there are on this site from people who can't.
If you wanted to redecorate your house, you would need to know how much carpet, paint or wallpaper you would need - you would use area and perimeter to work this out.
The perimeter of the square is 96.