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This study aims to find out empirical data from the analysis of Electronic School Books (BSE) for students of Class IX Middle Semester I. There are 3 (three) triangles elements, namely the vertex, angle and length of the sides of the triangle, each consisting of 3 (three). But to determine the existence of a triangle requires only two elements, namely the angle and length of the sides of the triangle. However, not the two elements that are used to determine the existence of a triangle, but eachdoi:10.26486/jm.v4i1.1022 doaj:e95b9237e1534efeb39c2d9df1e0e971 fatcat:sk4xmiped5aajfzbyz3cxayejy