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Vebianti, F., Sunardi, S., Suwito, A., Trapsilasiwi, D. and Oktavianingtyas, E. 2022. Analysis of Geometry Problem Solving Based on APOS Theory for Class IX Students. Journal of Education and Learning Mathematics Research (JELMaR). 3, 1 (Jun. 2022), 33-41. DOI:https://doi.org/10.37303/jelmar.v3i1.69.