Nasution, A.N.S., Irawan, B. and Rambe, I.H. 2021. Development of Ethnomathematical-Based Student Worksheets for Gordang Sambilan Musical Instruments on Cone Slice Material for Class XI SMA Primbana Medan. Journal of Mathematics Technology and Education. 1, 1 (Dec. 2021), 19-29. DOI:https://doi.org/10.32734/jomte.v1i1.7577.