# What is the problem of pi?

## What is the problem of pi?

The circumference divided by the diameter of a circle is always π, no matter how large or small the circle is! To help you remember what π is just draw this diagram….Approximation.

22/7 | = | 3.1428571… |
---|---|---|

355/113 | = | 3.1415929… |

π | = | 3.14159265… |

### Is pi or tau better?

Still, the choice of pi vs. tau can affect the clarity of equations, analogies between different equations, and how easy various subjects are to teach. Most people know π (pi) by the approximation 3.14, but do not know τ (tau) which, by definition, is twice as large as pi.

#### Why is March 14th called Pi Day?

It’s been an official national holiday since 2009. March 14 marks Pi Day, an annual celebration of the mathematical sign pi. Founded in 1988 by physicist Larry Shaw, March 14 was selected because the numerical date (3.14) represents the first three digits of pi, and it also happens to be Albert Einstein’s birthday.

**Why is pi irrational?**

Pi is an irrational number, which means that it is a real number that cannot be expressed by a simple fraction. That’s because pi is what mathematicians call an “infinite decimal” — after the decimal point, the digits go on forever and ever.

**How do you solve pi problems?**

Use the formula. The circumference of a circle is found with the formula C=πd=2πr. Thus, pi equals a circle’s circumference divided by its diameter. Plug your numbers into a calculator: the result should be roughly 3.14.

## Should we replace pi with tau?

It’s a lot to take in, and I, too, was once like you: I was taught the virtues of pi for years, going back to Pi Day parties in middle school. But instead of pi, we should celebrate tau, an alternative circle constant referred to by the Greek letter τ that equals 2π, or approximately 6.28.

### Is pi a real number?

Pi is a number that relates a circle’s circumference to its diameter. Pi is an irrational number, which means that it is a real number that cannot be expressed by a simple fraction. That’s because pi is what mathematicians call an “infinite decimal” — after the decimal point, the digits go on forever and ever.