we do not regularly use pi in our everyday life. But suppose you some how end up one day painting a cylindrical room. You will have to use pi to find out the circumference or surface area of the room you will have to use pi to figure out how much area you will have to paint
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If you mean pie: it is eaten. If you mean the number pi: It is used in all sorts of situations. Whether you use it in "real life situation" mainly depends whether you work in engineering. Most people won't use the number pi in their daily lives.
You will use the numbers pi and e (or applications which use them).
Area in a circle = (pi) times (square of the circle's radius)You can use any number you want to use for (pi) in that formula. The closer yourchoice is to the real value of (pi), the closer your result will be to the real area.If you decide to use 22/7 , then your result will be only about 0.04% bigger than thereal area. That's very good accuracy, and that's why a lot of people use 22/7 for (pi)even though it doesn't look very impressive.
You can use it to build buildings, pools, and and if your boss gives you a mathematical equation, you can answer it.
No. The square root of negative one is an example of an imaginary (not real) number. Pi is irrational, but real.