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I. NTRODUCTION Problem solving plays an important role in mathematics education because it could train students to think mathematically. This problem solving also designed students to create new ideas, discover new techniques or products. Not of all in mathematics could be categorized in problem solving even though mathematic is the form of a description problem whose solution requires mathematical calculation. If the questions given to students and students immediately know how to solve it then the problem is not a problem-solving category. In this case, a problem can be categorized in problem solving if the given problem is not a problem that is often studied by students and problems that have been known to answer from courses that have been obtained by students. Stages of problem solving: 1. understand the problem; 2. Plan the solution; 3. resolving the problem as planned; 4. reflect / reexamine [3]. In general, the difficulties of students in solving the problem description is that students have difficulty in understanding the problem. According to Junaedi research states that there are still students who take no action against the problem of proof though only at the stage of understanding the problem (understand the problem) [1].

Error Analysis of Newman to Solve the Geometry Problem in Terms of Cognitive Style