“…In two of the sporadic cases, (150 • , 60 • , 60 • ) and (100 • , 60 • , 60 • ), it is very easy to show that the triangle can tile in one way only (up to reflection) [2]. The tiles in the infinite family {(180 • − 360 • /n, 360 • /n, 360 • /n), n odd} each tile in a large number of different ways, which can be enumerated using Burnside's theorem.…”