Learning Obstacle of Construction and Congreeting Materials Based on Didactic Situation Theory in Class IX Students Vanya Aridanthy (a*), Dadan Dasari (b), Sufyani Prabawanto (b)
Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Jl. Dr. Setiabudi No.229, Bandung 40154, Indonesia
*vanyaaridanthy[at]upi.edu
Abstract
This research is motivated by the existence of learning barriers where students cannot follow the lesson well which is marked by the presence of certain obstacles in achieving learning outcomes, especially mathematics. This study aims to obtain learning obstacles based on didactic situation theory in similarity and triangle congruence learning in junior high school. The subjects of this study were students of class IX SMP Negeri in Padang. This research is a qualitative research. The data collection used is a written test and interviews. The data analysis technique is based on the didactic situation theory view and other theories that support it. Based on data analysis, the identified learning obstacles were obtained based on the results of student answers, interviews, and analysis of textbooks used in learning. Learning obstacles found include: (1) Many students are wrong in the procedure for naming triangles and are wrong in calculating the ratio of the sides of two similar triangles, (2) Students do not interpret the concept of parallelism as two triangles that have sides. side-by-side comparison. match and do not know to place the corresponding sides, (3) Students do not master the prerequisite concepts and make mistakes in basic arithmetic operations, (4) Students cannot solve the problem of congruence concepts and triangle congruence related to the triangle inequality theorem.
Keywords: Learning Obstacle- Construction and Congreeting Materials
