How many sides does a circle have? (from 5yo) Triggered quite a fun discussion about how we might decide what "side" means, what different plausible answers mi

How many sides does a circle have? (from 5yo) Triggered quite a fun discussion about how we might decide what "side" means, what different plausible answers might be (undefined / zero / one / infinity) and which perspectives might be the most satisfying, useful or interesting. Got to discuss a lot of concepts that hadn't really come up at school yet.