From Lampung Culture to Geometric Understanding: A Digital Ethnogeometry Framework with Augmented Reality
DOI:
https://doi.org/10.58524/oler.v6i3.1306Keywords:
Augmented Reality, Design-Based Research, Digital ethnogeometry, Ethnomathematic, Geometry learningAbstract
Geometry still becomes difficult for students when spatial relationships are taught mainly through procedures and fixed images that have little connection with the daily environment. This study develops and validates the Digital Ethnogeometry Model (EGL-Model) at the expert level. The model combines Lampung ethnomathematics, Van Hiele theory of geometric thinking, CTML, and AR. Design-Based Research approach is applied, but the work only covers the early design cycle. Activities include desk-based preliminary inquiry, development of a conceptual framework, creation of an offline Unity 3D AR proof of concept, evaluation by experts from different fields, together with design revision. Menara Siger, Lamban Dalom, and Lampung Tapis connect with junior-secondary geometry topics. These cultural objects are placed within five learning stages: cultural artifact exploration, geometric identification, formal concept connection, cultural value reflection, together with mathematical problem solving. Five experts assessed the model in terms of pedagogical coherence, cultural authenticity, and technological functionality. The corrected overall mean reached 4.21/5.00, which passes the predetermined criterion for a highly valid design. Cultural authenticity had the highest mean at 4.27, followed by technological functionality at 4.19 and pedagogical coherence at 4.18. Expert comments mainly ask for a clearer connection between learning stages, stronger cultural explanation, and a clearer interface. Findings indicate that experts consider EGL-Model content and design valid as a proof of concept. However, the results do not confirm teacher or student usability, classroom practicality, or learning effectiveness. These aspects need to be examined within a later field-based DBR cycle
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