Question

What is pi? or pie. :P

Answer 1

Pi is te sixteenth letter of the greek alphabet, but in math, Pi is basically a number that goes on. If u divide the circumference of any circle by its diameter, you get pi. Also, because it is an irrational number, 3.14 is equal to pi. This means that when u write pi as a decimal, it goes on. The first six digits are 3.14159. In some practical cases, u only need this, but in most cases, 3.14 is enough.    

Answer 2

Pi is the correct spelling. And what is it? Well Pi is what you get when you take a circle's circumference and divide it by it's diameter. Pi is also the 16th letter of the Greek alphabet. It is shown using this symbol:
`\pi`

EDIT:

And pie is a baked dish that is usually filled with fruits but can be filled with vegetables and / or meat.