Y.S. Eko, S. Prabawanto, A. Jupri
This study aims to analyse students' justification in mathematical concepts in the topic of trigonometry. This research was an explorative research conducted on 30 high school students in Bandung, Indonesia. The results showed that 7% of students were able to solve the problem correctly with correct justification, 66% of students solve the problem correctly with wrong justification and 27% of students answered wrong with wrong justification. Further analysis found that students who answered correctly with correct justification are at level 4 where the students provide clear, complete justification and with the right concept. Students who answered correctly with the wrong justification generally are at level 2 and level 3 where the justification given is very short and part of the justification contains a misconception of mathematics so that it can't be determined whether the student really understand or not. Students who answered incorrectly with wrong justification generally are at level 2 where their justification still contains a misconception of mathematics because of lack of understanding of the concept of trigonometry. On the other hand, the student understands that he must associate the sine concept with the angle of a triangle but he does not know how to do it. © 2018 Published under licence by IOP Publishing Ltd.
Department of Mathematics Education, Universitas Pendidikan, Indonesia
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