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Several previous studies indicate that students have difficulty in understanding the concept of line and angles. In their worksheets, the material presented in abstract form is not used in a related context. The purpose of this study is to produce valid and practical student worksheets based on the ethnomathematics of Gending Sriwijaya dance on lines and angles material. The research method used is development research with preliminary design and formative evaluation which consists of expert review, one to one and small group. The validity is obtained at the expert review and one-to-one and the practicality is obtained at the small group. The research subjects are students of class VII Mts Patra Mandiri. The data collection techniques in this research were validation sheets, interviews and questionnaire sheets. The results of this research is producing a student worksheets based on the ethnomathematics of Gending Sriwijaya dance on Lines, and Angles material which are valid and practical, the validity based on the validation sheet as well as comments and suggestions given by validators and students at one to one. The practical based on the questionnaire sheet as well as comments and suggestions given by students at small groups. [ABSTRACT FROM AUTHOR]