Geometry Exploration for the Development of Ethnomathematics Worksheet Based on the Ornament of Jingah River Jami Mosque

Lack of availability culturally oriented worksheets around students to improve the character loving motherland. The Merdeka Curriculum allows educators develop teaching materials adapted characteristics each region. This study aims establish a worksheet with ethnomathematics exploration ornaments Jingah River Jami Mosque. research method used is Plomp model development which consists four stages, namely: (1) initial investigation; (2) designs; (3) construction; and (4) test, evaluation, revision—methods data collection, namely observation, interviews, questionnaires. analysis technique descriptive qualitative quantitative. subjects included experts as validators, 7th-grade junior high school on limited basis. results validator's assessment were 4,77, restricted group trials 80,00%. So ethnomathematics-based student for ornament mosque are obtained, valid, practical.