Students Reasoning Capabilities to Solve HOTS Geometry Materials

This study aims to describe students’ reasoning abilities to solve HOTS questions on geometry material. Type of this research is descriptive qualitative. Subjects of the research were 10 students of 12th grade at Senior High School which were taken using a purposive sampling technique. Data collection was obtained from the result of reasoning ability tests and interviews. The validity of the data in this study used a triangulation method. Based on the analysis of data obtained: 40% of students can submit allegations, students that can do mathematical manipulation and give a reason with proof through the solution both of them are 30%, and only 10% of students can draw conclusions from statements and check the validity of an argument. The results of this study indicate that students’ reasoning abilities are still low. Many students are not able to draw conclusions from statements and check the validity of an argument. This is caused students having difficulty determining the distance in space, besides that it has not been able to connect statements that correspond to the problem of question.