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Abstract. The purpose of this research is to know the effect of learning media on the junior high school students- critical thinking skills on the topic of plane geometry by using hawgent dynamic mathematical software. The sample of this research would be 9th grade student in one of the junior high school in Cimahi with a total of 30 students in the school year of 2019/2020. The collection of the data is by using pre-test and post test to compare the critical thinking skills of the experimental class with the controlled class. The result of this research is that hawgent dynamic mathematical software boost the students- critical thinking skills and also comparing the increase of students- critical thinking skills on the topic of plane geometry.