Students’ Errors in Solving Word Problems Involving Angles of Elevation and Depression and Performance Level in Grade 9 Trigonometry: Basis for Development of a Teacher-Made Material. IJLTEMAS [Internet]. 2025 Apr. 8 [cited 2026 Jun. 11];14(3):216-35. Available from: https://www.ijltemas.in/submission/online/article/view/1597