Pratiwi, T., Siroj, R., & M., M. (2018). THE DEVELOPMENT OF THE STUDENT ACTIVITY SHEET-BASED PROBLEM-SOLVING METHODS ON THE MATERIAL OF THE TRIANGLE. JOURNAL of MATHEMATICS SCIENCE and EDUCATION, 1(1), 67-86. https://doi.org/https://doi.org/10.31540/jmse.v1i1.135