Khongpinit, R., Phattarachaleeku, M. and Chiangpradit, M. 2022. Development of Mathematics Learning Activities Base on Polya’s Method with Geogebra Program to Enhance Mathematical Problem Solving on Rectangles for Prathomsuksa 4 Students. Journal of Education Rajabhat Maha Sarakham University. 19, 3 (Dec. 2022), 215–226.