Laohavatin, P. ., Chaiyaphan , M., & Rattanapirun, N. (2026). THE DEVELOPMENT OF BASIC GEOMETRIC SKILLS USING CREATIVE ACTIVITY SETS FOR THIRD-YEAR KINDERGARTEN STUDENTS. Journal of Research and Innovation for Sustainability (JRIS), 3(2), 62–78. retrieved from https://so17.tci-thaijo.org/index.php/JRIS/article/view/1489