This study aims to improve student learning outcomes on triangle material by applying realistic mathematics education learning models to students. This research is a class action research which consists of two cycles. The results of the study: (1) The process of learning mathematics through the application of the resource-based learning approach at SMP Negeri 1 Sitolu Ori is good, (2) In the first cycle the results of observations of the implementation of the learning process for teacher respondents through the application of realistic mathematics education learning models reached an average value of 64.38% with a sufficient category. In the second cycle, the results of observations of the implementation of the learning process for teacher respondents through the application of realistic mathematics education learning models reached an average of 85.00% with a good category and based on the average questionnaire results 88.69% classified as excellent. In the first cycle, the implementation of the learning outcomes test obtained an average of 64.52 learning outcomes and included a sufficient category, with a percentage of completeness of 52.38% and unsuccessfulness of 47.62%. In cycle two, the implementation of the learning outcomes test obtained an average of 83.21 learning outcomes and included in the good category, with a percentage of 100% completeness and 0% unsuccessful, so that learning completeness reached the target of 75%.
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