Why does pie equle to 3.14159265358979323846426338?

Pi (π) doesn't *equal* 3.14159265358979323846426338. That's just a very close approximation of its value.

Here's why:

* Pi is an irrational number: This means it cannot be expressed as a simple fraction (like 1/2 or 3/4). Its decimal representation goes on forever without repeating.

* Geometric definition: Pi is the ratio of a circle's circumference (distance around) to its diameter (distance across). No matter how big or small the circle, this ratio always stays the same.

* Approximation: Because pi's decimal goes on forever, we can only use approximations. The number you provided is a common one, but we can get even more precise with more digits.

Think of it like this: Imagine you're trying to measure a piece of string. You can't get the exact length, only a very close measurement. Pi is like that string, always stretching out with more digits, never ending.