Lopi Sandeq Construction Ethnomathematics: Analysis of Geometry and Numeracy System of the Mandar Culture

Ida Farida; Widya Ningsih; Aulia Mutmainnah; Lalu Muh. Yunus; Nurhidaya Nurhidaya; Aprisal Aprisal; Yusfa Lestari

doi:10.30998/jkpm.v11i2.3480

Authors

Ida Farida West Sulawesi University Author
Widya Ningsih West Sulawesi University Author
Aulia Mutmainnah West Sulawesi University Author
Lalu Muh. Yunus West Sulawesi University Author
Nurhidaya Nurhidaya West Sulawesi University Author
Aprisal Aprisal West Sulawesi University Author
Yusfa Lestari West Sulawesi University Author

DOI:

https://doi.org/10.30998/jkpm.v11i2.3480

Keywords:

Lopi Sandeq, Geometry, Numeracy, Mandar Culture, Ethnomathematics

Abstract

Standard mathematics education often overlooks the rich mathematical concepts embedded in local cultures, leading to a gap between formal learning and indigenous knowledge. This study explores the ethnomathematical elements in the construction of the traditional Mandar boat, the Lopi Sandeq, which relies on intuitive mathematical principles. Using an ethnographic approach, data were collected through observation, documentation, and in-depth interviews with Punggawa in Karama Village, Polewali Mandar. Data analysis employed mathematical abstraction to transform local knowledge into formal concepts. The findings reveal that geometric integration occurs within its main components: the triangular principle on the sail (Sobal), a parabolic curve on the hull for hydrodynamic efficiency, and bilateral symmetry in the equilibrium system of the baratang and palatto’. Additionally, the traditional numeracy system based on depa units (dappa) consistently applies specific dimension ratios tailored to the boat’s function (fishing vs. competition). This study concludes that the Lopi Sandeq serves as a living mathematics laboratory with great potential for integration into the Independent Curriculum (Kurikulum Merdeka) as a concrete, Culture-based learning medium.

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