<![CDATA[The purpose of this study is to determine the effectiveness of the use of GeoGebra media in terms of understanding students' mathematical concepts in dimension 3 material. This research is a type of quasi-experimental research with a quantitative approach. The research design used is a type of nonequivalent control group design. This research took place at the Abhariyah Islamic High School, West Lombok. The population in this study were students of class X high school. The sample of researchers took all the students of class X sma with a total of 30 students, of which 15 students were used as experimental classes and 15 students in the control class. The instrument used in this study is a test. Hypothesis tests were carried out using an independent samples t test. The results showed that the use of GeoGebra media can help students in understanding mathematical concepts (effectively). With the calculation results obtained are as follows: the average Post-Test of the experiment and control classes is 13.6 and 12.4. With a significant degree of α = 5% = 0.05, db = n – 2 = 30 – 2 = 28. So that t_tabel=t_((0,025;28) )=2,048 with t_hitung=2,738. Post-Test experiment and control classes show that t_hitung>t_tabel then H_0 rejected. So, it can be concluded that post-test experimentation and control have differences. Based on the calculation results of the N-Gain Score test, it shows that the average value of the N-Gain Score for the experimental class is 72.7944 or 73% belonging to the category of quite effective. With a minimum N-Gain Score of 58.14% and a maximum of 88%. And it can be concluded that this means the effective use of GeoGebra media in terms of understanding students' mathematical concepts in dimension 3 material.]]>
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