Nisa Triyatul Fitri, Arif Muchyidin and Reza Oktiana Akbar 2022. Mastery of Trigonometry Material and Its Effect on Students’ Ability to Solving Three Dimensional Problems. Journal of Mathematics Instruction, Social Research and Opinion. 1, 2 (Jul. 2022), 97–106. DOI:https://doi.org/10.58421/misro.v1i2.23.