How to Calculate Pi in Geometry

When i shut one f my students discovered that, one person started screaming. She is saying, that's wrong. That' that can't be right. So i said, well, who says it should be round just because the euclidian circle is round in traditional geometry? This is a new world. We're making new rules. And so woultd this diamond shape. You have to now think if i measured the circumference point, like, assume nobody knows anything, including myself. I already can expressd myself enough in this conversation. Ok, all right, then you could say, what is pie? You know, to calculate pie in this geometry. Now that takes you back