Profile of the Student’s Mathematical Reasoning Ability in Solving Geometry Problem

Abstract

This research aimed to describing profile of the students’ mathematical reasoning ability in solving geometry problem. This research used descriptive qualitative. The samples of the research consisted of 33 Vocational High School students of XI TKJ B class who were chosen based on the results of reasoning ability test. The students’ profile data in solving geometry problem were collected through the interview of the students’ works. The results obtained were analyzed based on the indicators of reasoning ability including a) formulating Presumption; b) performing mathematics manipulation; c) checking the validity of an argument; d) drawing a conclusion. The results of the research revealed that (1) the students with high reasoning ability tended to master the indicators of problem solving with a good category, (2) the students with average reasoning ability tended to master the indicators of problem solving with a fairly good category, (3) the students with low reasoning ability tended to master the indicators of problem solving with poor category.