#mathober is starting today – one math prompt per day to express yourself in some way! https://www.fractalkitty.com/mathober-2026-prompts/ Day 1: "Perimeter of an Ellipse" Calculating the perimeter requires elliptic integrals. But I learned about a pretty efficient method to approximate it, which uses the arithmetic-geometric mean! In my drawing, all ellipses have the same perimeter! Imagine squishing and stretching a piece of wire. Coded in #p5js, then drawn using #krita. #math #mathober2026