Waiyadet P, AreeraksakulKonglok S, Thueakthong V. ACTION RESEARCH TO STUDY MATHEMATICS ACHIEVEMENT BY USING MATHEMATICS LEARNING ACTIVITIES WITH ONLINE FLIPPED CLASSROOM IN THE TOPIC OF PYRAMID CONE AND SPHERE FOR GRADE 9 STUDENTS AT LABORATORYSCHOOL OF PHRANAKHON SI AYUTTHAYA RAJABHAT UNIVERSITY. AJPPA [Internet]. 2024 Feb. 16 [cited 2024 May 10];6(1):33-48. Available from: https://so08.tci-thaijo.org/index.php/AJPP/article/view/2324