Zuzano F, Musdi E, Lufri L. Designing a Hypothetical Learning Trajectory with Open-Ended Tasks: An Approach to Teaching Angle Measurement. ijirss [Internet]. 2025 May 7 [cited 2025 Dec. 13];8(3):1563-72. Available from: https://ijirss.com/index.php/ijirss/article/view/6837