Robertus Daya (2023) “ANALYSIS OF ABILITY IN UNDERSTANDING MATHEMATICS CONCEPTS ON THE CIRCULAR MATERIAL OF STUDENTS OF CLASS VIII OF SMP NEGERI 2 BAY IN THE 2020/2021 STUDY YEAR”, Afore : Jurnal Pendidikan Matematika, 1(2), pp. 78-87. doi: 10.57094/afore.v1i2.725.