прилагательное [математика] четырёхугольный Синоним(ы): quadrangular
adjective Etymology: Late Latin tetragonalis having four angles and four sides, from tetragonum quadrangle, from Greek tetragōnon, from neuter of tetragōnos tetragonal, from tetra- + gōnia angle — more at -gon of, relating to, or characteristic of the tetragonal system • tetragonally adverb