The study came into the background by the many students who had difficulty learning geometry in particular. The purpose of the study to describe the process of eighth graders' thinking in resolving a fourth matter. The type of research used is a qualitative approach. The data-gathering method used is tests and interviews. The subject of this study is two visualization level students, two analytic levels, and one informal deduction student. The result is that students of the visualize level are

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... ften quelled to settle the matter at a level of four, but when given a student's explanation can adjust, resulting in an equilibrium. Students' level analysis has been quizzing when seeking a consensus solution, but after accommodations are underway, students can understand the problem by equilibrium. The students of the informal deduction level have not been quizzed to complete the fourth matter, so the information gained is assimilated and equilibrium.