หวังโสม อ, เลิศอมรพงษ์ ช, สมใจเพ็ง ต. EFFECTS OF LEARNING ACTIVITIES ON CONGRUENCE, BASED ON TEACHING PROCEDURE OF VAN HIELE BY USING THE GEOMETER’S SKETCHPAD (GSP). JHS.TRU [Internet]. 2018 Oct. 1 [cited 2024 Sep. 21];12(29):206-1. Available from: https://so03.tci-thaijo.org/index.php/trujournal/article/view/148711