Gregory Semah. Parallel. Book two: Cheater (№ 317631)

Well, what's the formula of circle area? Two PI er? Or three PI er? Or PI er in the square? And what's in the box? PI or er? How much do we pee? A couple of minutes of intense head scratching, I managed to remember what PI is, and how many of these button need to get the area of a circle.