When do you use perimeter in real life?

like if you wanna build a garden and u wanna have a fence...so then like you would use perimeter to find out how much fence u would need....if that makes sense to you :P hopefully it does...if it doesn't its cuz of MLE (my lame English)

Your lazy English more likely :-)

When... Well, as suggested, length of Fencing materials. Finding the perimeter is quite a common calculation in many practical geometry applications.

I'm intrigued by questions like this, not for their specific content but for their having been asked at all. They suggest their questioners have never encountered real-life arithmetic and maths - are they school pupils perhaps?

I'm also struck by the very low knowledge of many Answers users, of the most basic, school-level, geometry etc. The section on swimming-pool maintenance for example, is full of "How do I calculate the amount of water..." questions that can be answered from an ordinary school text-book! Sometimes the questioner fails even to give all the dimensions needed.

So is there something fundamentally wrong with maths & arithmetic education somewhere? Or do so many genuinely find numbers very hard to grasp? (I can't learn maths above a certain level but I can work out basic volumes!)