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In this study, it is aimed to determine whether the mathematics education approach of Salih Zeki, one of the late Ottoman mathematicians, has a constructivist character. For this purpose, 6 geometry textbooks written by Salih Zeki at middle school level were examined. Document analysis method was used in the research. In order to determine whether the textbooks have a constructivist character, 11 criteria have been determined and books have been analyzed based on these criteria. According to the results obtained, 6 geometry textbooks written by Salih Zeki have a constructivist character.