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The purpose of this study was to analysis and examine the geometrical understanding of Junior High School students on the topic of congruence based on Van Hiele’s thinking level. The research method was descriptive qualitative. The research subjects were grade IX students in one of the State Junior High Schools in Pontianak. Data collection used geometric understanding tests and placement tests of Van Hiele think level. The data is analysed using descriptive analysis. The results showed that the mean score at level 1 is 47.3; at level 2 is 53.6; and at level 3 is 60.1. Overall the average geometric understanding of students was still low, at the means of 53.67.The importance of knowing the level of students' geometric thinking is to minimize the same errors in understanding geometry. So that it is easier to achieve maximum success in learning geometry.

Analysis of the Geometric Understanding Ability of Junior High School Students in Congruence Subject Based on the Level of Van Hiele Thinking