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It is the ratio between a circumference of a circle and the diameter (they needed a number to describe this).

Q: Why did they need pi?

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You should know pi because of math. You need pi when you are dealing with circles. The only thing you really need to know about pi is 3.14 though.

You only need one decimal in pi (3.14). Pie goes on forever, if that's what you're asking.

You need the formula circumference = pi x diameter pi = 3.14.. This is by the way the definition of the special number pi.

Pi has over two billion digits but you can use 3.14 or if you need a fraction 22/7

Circumference = 2*pi*radius or diameter*pi

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You should know pi because of math. You need pi when you are dealing with circles. The only thing you really need to know about pi is 3.14 though.

Everyone needs Pi.

If you are wanting to become a PI you will need to obtain a PI license. To do that you will need to have a licensed PI sponsor you and then take your PI test. If you pass that, you will get your license. Good Luck.

You only need one decimal in pi (3.14). Pie goes on forever, if that's what you're asking.

You need Pi to find the radius or circumference of a circle and there are many more uses!

C = 2 * (pi) * (radius) So plug in 2 for radius C = 2 * (pi) * (2) C= 4(pi) If you need to approximate multiply 4 times 3.14. If you do not need to approximate then your answer is 4(pi)

You need the formula circumference = pi x diameter pi = 3.14.. This is by the way the definition of the special number pi.

Pi has over two billion digits but you can use 3.14 or if you need a fraction 22/7

Circumference = 2*pi*radius or diameter*pi

A circumference is the distance around a circle. To find a circle's circumference you need to follow the formula: d*pi The d stands for diameter and pi is 3.14. You need to mulitply the length of the diameter by pi for the circumference. Or, if the diameter isn't given, multiply the radius by 2 and then multiply that by pi.

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So that you can find the circumference of a circle.