With Valentine’s Day on 14 February it’s topical to look at the mathematics of the heart shape. Here’s a few ideas:

- Using circles and triangles see this site
- String drawing epicycloid curve from The MathenĂ¦um (using factor 2)
- for the history of the cardioid see The MacTutor history of maths site: includes an interactive version
- For an example in Desmos see here
- Heart curves from Wolfram world these formulae can be used in graph plotters