Corona Math: How many people fit in your walking area?

In Belgium, where I live, we had a "light lock-down" back in March and April 2020, which means we were allowed to walk within a 2km radius from our home. I decided to calculate how many people would fit into my walking area (my circle with a 2km radius), considering we have to keep 1.5m distance from one another. (I have made that 2m for simplicity). I also haven't taken any buildings or water reservoirs into account, so my circle is an open plain.

My animation is online at: https://editor.p5js.org/simontiger/present/VuXRGMLPp (Press the space bar to get to the next slide).

Source code: https://editor.p5js.org/simontiger/sketches/VuXRGMLPp