### There are only 15 possible pentagonal tiles, research proves

The 15 types of pentagonal tiles and their 4 specific types © Michael Rao, Laboratoire d’informatique du parallélisme . Credit: CNRS/Inria/ENS Lyon/Université Claude Bernard Lyon Tiling the plane with a single pattern is a mathematical problem that has interested humans since Antiquity, notably for the aesthetic quality of tiles in mosaics or tiling. One of…