Abstract :
This study discusses the development of a GeoGebra-based mathematical module on geometry transformation material. Development of a valid, practical, and effective GeoGebra-based module
The type of research used is Research and Development (R&D). This mathematical module development model was developed based on the ADDIE (Analysis, Design, Development, Implementation, Evaluation) development model. The test subjects in this study were students of class XI MA Muhammadiyah 04 Beton
The results of the research based on the development model indicate that the GeoGebra-based mathematical module on the geometry transformation material is valid, practical, and effective. The first step in this development research is the analysis step. where the researcher observed the MA Muhammadiyah 04 Beton. Next is the design where the researcher begins to design the module to be developed. After the module is designed, the next stage is development, where the researcher develops the module. After the module has been developed, validation is carried out by experts, including material experts and media experts. The results of the validation carried out by the material expert validator are 77% "valid" criteria and the results from the media expert validator are 82% the "very valid" criteria. After obtaining the results from material and media experts, the module can be revised according to comments and suggestions for the next step, namely implementation (implementation) where the module is tested on class XI MA Muhammadiyah 04 Beton students. After the test is complete, students are given a response questionnaire to provide their responses. The last stage is evaluation (evaluation), at this stage the module is measured from the percentage of the results of the student response questionnaire, the level of practicality and effectiveness For the results of student responses the practicality level is 9196 which is in the "very practical" criteria and the results of the effectiveness level is 80% are in the "effective" criteria.