This study aims to firstly explain the use of hadrah art in Parit Lengkong Village, Sungai Ambawang District, Kubu Raya Regency. Second, exploring ethnomathematics on hadrah art musical instruments in Parit Lengkong Village, Sungai Ambawang sub-district, Kubu Raya Regency. This study uses a qualitative approach with ethnographic types. Data collection techniques used direct communication techniques with structured interview guide instruments and documentation. There were 3 research subjects, who were selected using a side purposive technique. The results of this study found two research objectives. first, the use of hadrah art musical instruments is staged in various religious events, weddings and family events. Hadrah arts musical instruments include drum/bass, flap, tar, and darbuka. Second, ethnomathematics exploration on the tar and flap musical instruments has various types of angles while on the darbuka musical instrument there are conical shapes and tubular drum/bass.
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