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# What does pi the formula in math stands for?

Updated: 10/19/2022

Wiki User

13y ago

In certain formulas, including most that involve circles, you will see 'pi'.

This pi always has the same value, approximately 3.14159...

However, this number is irrational, which means it never terminates (ends) or repeats.

But what exactly is pi? Pi is the ratio between any circle's circumference and its diameter. This ratio is always the same, no matter how big or small the circle is, but the degree of precision might vary depending on how big the circle is.

Why is Pi useful?

Pi allows us to calculate the diameter or area of any circle, but also has many other uses.

In order to use these formulas, though, we need to define the terms we are using.

Circumference - the distance around the circle

Diameter - the length of a straight line segment that passes through the center of the circle

Radius - the distance from the center of the circle to the circle itself

To calculate the circumference, multiply the diameter by pi (3.14...)

To calculate the area, square the radius, then multiply this by pi (3.14...)

In symbols:

Circumference = diameter x pi

Hope this helped.

Wiki User

13y ago

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The formula of percentage is pi. This is used in math.

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Well, first you need to know the formula for what you are doing (usually with pi it is area or circumference).

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Here is the formula for area (you do the math) pi = 3.14 r = radius Area = pi * r2

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### How do you calculate the circumference of a circle if you know the diameter?

Multiply the diameter by Pi as the formula Pi x d = Circumference. Where d stands for diameter.