<![CDATA[The aim of this research is to develop learning media using Articulate Storyline 3 that are valid, practical, and effective to improve students' ability to understand flat plane topics. The study was carried out at MTSS AL KAROMAH BERASTAGI. The subjects of this research were students of class VII-A. This research is research and development (R&D) using the ADDIE Model. The data collection technique uses a questionnaire assessment sheet for material experts, teaching material experts, learning practitioners and student responses. The results showed that learning media using Articulate Storyline 3 obtained an average percentage of 93.47% with the criteria of "very valid" according to the assessment of teaching materials experts and based on media material experts obtained an average percentage of 77.5% with the criteria " very valid". Based on the practice of learning carried out by the mathematics teacher getting 91,4% with the "very practical" criteria. Based on the effectiveness assessment of the 20 students, they got an average percentage of 88.90% with the criteria of "very effective".]]>
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