“…Based on the results of observations, it was found that the shape of the flat shape (geometry) in this study is ethnomathematics as a form of exploring the concept of cultural mathematics in the traditional engklek game, namely in a grid pattern consisting of 3 etching shapes, namely plane maps, house plots and people plots which show a flat shape shape. Namely square, rectangle, square, circle, and trapezoid, the gaco used in the traditional engklekt game also contains two-dimensional geometry, namely triangles, circles, ellipses, trapezoids and rectangles, in line with research on ethnomathematics of other cultures in Indonesia, for example in several Rajapolah woven crafts contain mathematical elements, one of which is the use of the tessellation or tiling principle, geometric shapes that can tessellate for example squares, triangles, regular pentagons, regular hexagons and can also be curves [17], the Muaro Jambi Temple building consists on sus ancient brickwork in square and rectangular shapes on the walls of Gumpung Temple, the arrangement of bricks at the entrance to Gumpung and Umpak Batu Temples so that the mathematical concept in the form of geometry is also found in Muaro Jambi Temple [18], several parts of the grand mosque in Yogyakarta have aspects Mathematically, namely the carvings (ornaments), the pavilion, the roof of the mosque, the kentongan (drum), parts of the floor and the gate related to the concept of geometry including flat buildings and the spatial structure of the Great Mosque in Yogyakarta [19], traditional Biak-Papua cultural houses have a mathematical concept, namely the roof shape of rum som (rectangular and triangular shapes, sram mankubui roofs (trapezoidal and triangular), tifa (conical) [21], in the Thelas Keta traditional event for the noemuti community there are several mathematical concepts, namely circles, rhombuses, and rectangles [31], the shape of the house building is at Minangkabau there is a mathematical concept, namely in two-dimensional geometry (geometry), namely squares, rectangles, trapezoids, triangles, isosceles triangles, equilateral triangles, pentagons, circles and rhombuses [32,33].…”