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 (Feb. 2023), 78-87. DOI:https://doi.org/10.57094/afore.v1i2.725.