<![CDATA[The use of media in the learning process greatly affects students' learning outcomes. Geogebra can visualize geometric concepts as a learning medium. This research aims to develop a website-based learning media assisted by Geogebra to improve student learning outcomes on geometry material, specifically parallel lines and angles for the 8th grade at SMPN 2 Kuripan, which is valid and practical. The method used is research and development (R&D) with the 4D model developed by Thiagarajan, which includes the define stage, design stage, develop stage, and disseminate stage. The results from the questionnaires, interviews, and post-test learning outcomes were analyzed for validity, practicality, and effectiveness. The research results show that the developed media (1) is valid with very valid criteria; (2) practical with very practical criteria; (3) the learning outcomes of students using the Geogebra website are better than those of students who do not use the website as a medium. Based on the research, it can be said that the developed media is valid, practical, and effective in improving students' learning outcomes.]]>
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