ETNOMATEMATIKA PADA KONSEP SUDUT AKSARA KA GA NGA SUKU REJANG

Culture is a product of human creativity, taste, and creation that reflects the identity of a community group, while mathematics is a science built through rational thinking related to real objects and abstract concepts. Ethnomathematics integrates culture into mathematics education, with culture as a relevant learning resource. This study aims to find the ideas of angles in the Ka Ga Nga script, which is part of the cultural heritage of the Rejang tribe. The method used is descriptive qualitative with an ethnographic approach, involving a cultural expert and a mathematician as the main subjects. Data collection was carried out through observation of the script, in-depth interviews, and documentation. Data analysis includes collection, reduction, presentation, and drawing conclusions, with triangulation to ensure data validity. The results of the study indicate that the Ka Ga Nga script contains mathematical concepts, especially related to angles and geometric transformations. These findings have the potential to be developed into a source of mathematics learning, such as modules and Student Worksheets based on the Ka Ga Nga script, which can enrich the learning experience in a cultural context.