Kruelamai, P. and Keeratichamroen, W. 2024. A Comparison of Learning Achievement on Enjoyable Thinking with Pyramid Cone and Sphere and Problem Solving Ability of Grade 9 Students between Using MEAs and SSCS Model. Ratchaphruek Journal. 22, 3 (Dec. 2024), 116–130. DOI:https://doi.org/10.14456/rpjnrru.2024.38.