HARTONO, H.; KHAERIYAH, D. Z.; SARI, D. L.; ILFIANA, M.; NURSYAHIDAH, F. DEVELOPMENT OF LEARNING TRAJECTORY ON THE SET TOPIC FOR 7TH GRADE IN THE CONTEXT OF SEDEKAH LAUT TRADITION . Kalamatika: Jurnal Pendidikan Matematika, v. 6, n. 2, p. 181-194, 30 Nov. 2021.