Biber A.Ç.Tuna A.Daǧdelen I.Kepceoǧlu I.2023-09-102023-09-102019-08-0119272677https://hdl.handle.net/20.500.12597/17120truemathematics education | middle school students | parallelogram | quadrilateralsStudents’ Levels of Recognition of Parallelogram and of Establishment of ConnectionsJournal2-s2.0-85164788330