(Jaruwan Sonpang) จส, (Jensamut Sangpan) เแ. TEACHER ROLES FOR SUPPORTING STUDENTS’ GEOMETRIC PROBLEM - SOLVING ABILITIES IN CLASSROOM TAUGHT THROUGH OPEN APPROACH. JEI [internet]. 2018 Jan. 5 [cited 2026 Sep. 2];19(4):65-77. available from: https://so06.tci-thaijo.org/index.php/edujournal_nu/article/view/108400