The process of student’s thinking deduction level to solve the problem of geometry

Abstract

Each thinking level van Hiele will describe the process of thinking a people use learning the geometric concepts and types of geometric ideas thinks. This research is a qualitative descriptive research what aims to describe the thinking process of students at the level of deduction in solving geometry problems. The collection data’s method in this research is test and interview method. The test is classification of students’ thinking geometry level according to van Hiele using instruments developed by Usiskin, so that the students get the level of deduction. The test of geometry to knowing the thinking process students use 1 problem from the International Mathematical Olympiad (IMO) field Geometry. Interviews were conducted to the students to confirm the student’s work. The results of this study indicated that students at the level of deduction to solving geometry problems as accordance with the characteristics of van Hiele geomeri thinking in its level.