<![CDATA[This study explores ethnomathematical elements embedded in the architecture of four historic mosques in Banjarmasin City—Jami Sungai Jingah Mosque, Nurul Amilin Mosque, Sultan Suriansyah Mosque, and Tughfaturraghibin Mosque—and examines their potential contributions to secondary mathematics learning. A qualitative exploratory approach was employed, with data collected through visual observation, photographic documentation, and semi-structured interviews. Data were analyzed iteratively through data reduction, data display, and conclusion drawing. The findings show that key architectural features—such as column arrangements, roof forms, ornaments, and spatial organization—embody explicit mathematical ideas, including pattern regularity, plane and solid geometry, similarity, symmetry, and geometric transformations. Extending mosque-based ethnomathematics research beyond single-site descriptions, this cross-case exploration of historic mosques highlights recurring and distinctive geometric structures that can be leveraged for contextual learning. The study contributes a curriculum-oriented mapping of the identified elements to junior and senior secondary geometry topics, providing a basis for designing culturally grounded tasks and teaching materials.]]>
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