<![CDATA[This field‑based ethnomathematical study examines how three geometric transformations—reflection, translation, and rotation—are embodied in the woodcarvings of the Banjar Baanjung house. We conducted in‑situ exploration at a Baanjung house in Teluk Selong (Martapura) and worked directly with a traditional carver in Kuin Cerucuk (West Banjarmasin) in August 2025. Data collection combined on‑site photographic measurement with on‑plane scale references, motif tracing, semi‑structured interviews, and think‑aloud carving demonstrations. Using open and axial coding, we mapped motifs—daun jeruju friezes, tampuk manggis rosettes, gigi haruan zigzags, and paired panels on tawing halat—to transformation types and derived classroom‑ready parameters. Findings show: (1) bilateral reflection on paired panels, quantified through local axes and symmetry deviation; (2) translational friezes on daun jeruju with consistent period, corroborated by the carver’s use of spacing templates; and (3) rotational symmetry (typically order 4) on tampuk manggis, aligned with a radial layout technique. The study converts field‑verified cultural artefacts into learning materials that enable students to study transformations in a culturally grounded context. The contribution sharpens conceptual understanding while fostering cultural appreciation and yields a sequence of ready‑to‑use tasks and analytic prompts for secondary classrooms.]]>
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