what is pi^2 useful for?

Yum!

(It was round.)

Pi (square) is useful if you don't prefer Pi (round).......since......a square Pi is always easier to divide into equal portions than a round Pi .......

Talking of pies, I was having a cherry pie from Tescos when you sent that answer!

Hey....that looks pretty good.....think you could sneak me a piece????

Maybe...

Why don't you just get one from your local Tescos?