Jurnal Gantang VIII (1) (2023): 99-111 e-ISSN: 2548-5547 p-ISSN: 2503-0671 http://ojs.umrah.ac.id/index.php/gantang/index 99 Learning Design of Triangle Concept Using Palembang Culture for VII Grade Students Ica Ramadona * , Riza Agustiani, Atika Zahra, Agustiany Dumeva Putri Universitas Islam Negeri Raden Fatah, Palembang, South Sumatera, 30126, Indonesia Submission: March 21 st 2023; Accepted: June 23 rd 2023; Published: June 30 th 2023 DOI: https://doi.org/10.31629/jg.v8i1.5588 Abstract The triangle is still a topic worth discussing because many pupils still want assistance in comprehending the notion of triangles as a whole. The research aims to produce a triangular concept learning design using the Palembang cultural context for VII grade students with augmented reality technology. The research subjects comprised 19 students from Class VII of Al-Azhar 33 Islamic Middle School in Palembang. The method used is design research, divided into preparing for the experiment, and design experiment, divided into two cycles, namely pilot experiments and teaching experiments, and finally, retrospective analysis. The data in this research was collected by observation, interview, documentation, and test. The instruments used in this research are video and field notes for observation and interview, LAS for documentation, and post-test for test. The data analysis technique is descriptive qualitative. The final result of this study is Local Instruction Theory (LIT) which contains the learning process in 4 activities, namely describing the triangles of the Musi 6 Bridge, identifying the properties of triangles based on side lengths, identifying the properties of triangles based on the size of the angles and solving problems related to the properties of triangles based on the length of the sides and the size of the angles. The results show that the cultural defined context can be used as a reference point in triangle material in class VII SMP. Keywords: triangle; design research; local instruction theory; ethnomathematics I. Introduction Geometry is a branch of mathematics that students are familiar with, such as lines, planes, and space because they are often encountered in everyday life (Özerem, 2012; Sholihah & Afriansyah, 2018). Triangle is a flat shape taught to students since elementary school. Triangle shapes are familiar to students because there are many examples of these shapes in students' daily lives. However, in reality, junior high school students need help learning triangles, a common mistake is to show the number of angles in a triangle (Suryani et al., 2020). One of the subjects of mathematics taught in class VII of junior high school is the subject of triangular angles; studying the angles of triangles is very important because it relates to other materials in mathematics, especially in geometry (Irsaf, 2015; Suherman, 2011). According to (Hidayah & Fitriani, 2021; Hidayat et al., 2019), there are still many students who experience difficulties with triangle material; these difficulties include understanding triangular concepts and analyzing context problems related to triangles; many factors, including a lack of *Corresponding Author Email Address : icaramdonaa20@gmail.com Handphone : +62 852 6816 1023