Aunthongsiri, S., Hajisalah, S., Janjaroon, A., & Piasai, K. (2021). A Study of Matthayomsuksa II Students’ Geometric Proof Abilities in a Topic of Geometric Reasoning through Learning Activities with Graphic Organizer and Inquiry Process. ournal of umanities and ocial ciences, ajapruk niversity, 7(2), 125-139. etrieved from https://so03.tci-thaijo.org/index.php/rpu/article/view/254780