Density of optimal packings of three ellipses in a square.
Résumé
We prove that the most dense packing of three non-overlapping congruent ellipses of aspect ratio E ∈]0, 1] in a square is obtained for E = 1/3, with density equal to π/4. This result was already known for two ellipses (for E = 1/2), but is no longer true for an arbitrary number of non-overlapping congruent ellipses.