摘要:Thi researc i use fo(1 knowin th understandin o fourt grad student o elementar schoo i findin polygo are concep throug square-gri Tangram;(2 resultin th learnin trajector fo th studen i learnin polygo are throug square-gri Tangra b havin approachin PMR t th fourt grad students.Thi researc involve 2 student o fourt grad a Az-Zahra Palembang.I use desig researc methodolog o learnin polygo are throug square-gri Tangra include preparin fo experimen steps,teachin experiment,an retrsospectiv analysis.It’ resulte Learnin Trajector whic i connecte t th thre learnin proces activities,hence(1 determin kind o plan figur an plan partitione(usin an kind o employmen context);(2 determin th are ofsquar uni(usin square-gri Tangram);(3 foundin algorith o polygo area.Th resul show b usin PMR approach,square-gri Tangra i usefu a mode t suppor th student i findin polygo concepts.