Anuniwat, D., Pamuta, K. and Changsri, N. 2025. Students’ Mathematical Ideas in Problem-Solving Mathematics Classrooms: A Case Study of Circle Area Application. Ratchaphruek Journal. 23, 2 (Aug. 2025), 84–98. DOI:https://doi.org/10.14456/rpjnrru.2025.21.