Take a single pixel in Microsoft paint, or a single Block in Minecraft. That’s a super small, not very accurate circle right? Now make a bigger circle out of those blocks, and the bigger the circle you make the more accurate a circle it is right?
Imagine making a circle the circumference of the whole universe, but you’re still making it out of atom sized pixels. It’s super accurate, literally can’t get any closer to a circle… And yet, it still has points and corners that prevent it from being perfect.
The “ideal image” of a circle cannot ever exist truly in a world built of smaller things. It’ll always be bumpy, so there’s always room mathematically to make such a circle bigger and more accurate. But no matter how accurate you get, it’s still not a perfect circle, so the measurement of Pi gets closer and closer to “true” but never actually reaches “perfect” or “finished”.
Latest Answers