Havidah Hasibuan

This research is descriptive qualitative research with an ethnographic approach. Data collection techniques were carried out using observation, documentation, and literature review. Data analysis techniques using Spradley design: domain analysis, taxonomy, compatibility, and cultural themes. Based on the results of data collection, there were several mathematical elements in the traditional ombus-ombus cake typical of North Tapanuli.

Penelitian ini adalah penelitian etnomatematika yang bertujuan mencari unsur matematika berupa transformasi geometri pada ornamen interior balairung Istana Maimun sebagai sumber belajar matematika di sekolah. Penelitian ini merupakan penelitian kualitatif deskriptif dengan pendekatan etnografi.

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.