Juni Sahfitri, Firmansyah and Dwi Novita Sari 2022. Exploration Ethnomatematics in Musical Instruments Gordang Nine with Theory Geometry Two Dimensions and Three Dimensions. International Journal of Educational Research Excellence (IJERE). 1, 2 (Dec. 2022), 187–192. DOI:https://doi.org/10.55299/ijere.v1i2.214.