Developing Canva-based E-Module of flat surfaces in geometry for eighth

This development research is aimed at developing an e-module of flat surfaces in geometry for eighth graders and describing it based on validity, practicality, and effectiveness aspects. We used the 4D model, i.e., define, design, develop, and disseminate, as the development model and assessment sheets for the e-module as research instruments, later filled out by material and media experts to measure their validity. Other research instruments included assessment sheets for teachers as practitioners to measure practicality, student response questionnaires, and learning outcome test to measure the e-module’s effectiveness. The product was tested on 30 eighth graders, and results demonstrated that the material expert gave a mean score of 4.2 with a good criterion, and the media expert gave a score of 4.8 with an excellent criterion. Accordingly, the e-module developed was considered valid. Practitioners gave a mean score of 4.8 to the e-module, therefore classified as excellent and practical. Student responses were very positive to the e-module at 91.71%, and the classical completeness percentage based on the student learning test results was 96.67%, thereby declaring that the e-module was effective.