Kristiarta, Y. A. K., Wahyu Setyaningrum, & Marsigit. (2023). Problem Solving Approach Based on Blended Learning on Trigonometric Comparison of Right Triangles on Mathematical Concept Understanding Ability. Journal for Lesson and Learning Studies, 6(3), 516–526. https://doi.org/10.23887/jlls.v6i3.67275