Tiling an Equilateral Triangle

Abstract

Let $ABC$ be an equilateral triangle. For certain triangles $T$ (the "tile") and certain $N$, it is possible to cut $ABC$ into $N$ copies of $T$. It is known that only certain shapes of $T$ are possible, but until now very little was known about the possible values of $N$. Here we prove that for $N>3$, $N$ cannot be prime, and study more closely the possible tilings when the tile has a $\ddot{I}€/3$ angle.

24 pages, 11 figures. This version added pictures of new tilings found by Herdt, and a table of unsolved values of N