Manekat, S. ., A. L. Son, and M. M. L. . Siahaan. “An Analysis of Grade VIII Students’ Difficulties in Solving Circle Story Problems: A Study Based on Polya’s Problem-Solving Theory”. Brillo Journal, vol. 4, no. 2, June 2025, pp. 107-21, doi:10.56773/bj.v4i2.70.