<![CDATA[This research aims to identify the elements of mathematics, especially two-dimensional geometry concepts in Al-Mashun Great Mosque's building, to be implemented as a source of learning mathematics in the classroom. This research is descriptive-qualitative with an ethnographic approach. The main instrument in this research is a human instrument. Data were obtained from two interviewees, observations, and documentation. Data were analyzed by Spradley’s design: domain analysis, taxonomy, compatibility, and cultural themes. The research results show the elements of the plane figure in the Al-Mashun Great Mosque like triangles, quadrilaterals, octagons, polygons, and circles. These findings indicate that the Al-Mashun Great Mosque can be used in developing learning material like student worksheets or ethnomathematics-based textbooks.]]>
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