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This research to develop online teaching materials for geometry in junior high schools with a project-based learning approach assisted by Wingeom software that meets the criteria of being valid, practical and effective. This type of research is development research (R&D), with 5 main stages, namely: (1) Preliminary study; (2) Design of teaching materials; (3) development (expert validation, testing, revision); (4) Implementation; (5) Evaluation. The subjects of this study were junior high school students in the city of Cimahi, with a sample of 35 students of class VII. The research was conducted in the even semester regarding the geometry material, namely quadrilateral. The aspect that is assessed from the development of these teaching materials is to produce teaching materials that are valid, practical, and effectively used in online learning. The validity of teaching materials is seen from the results of 5 validators who reach valid criteria with very good categories. The practicality of teaching materials reaches practical criteria in terms of teacher and student practicality sheets. and the effectiveness of teaching materials in terms of the achievement of student learning completeness. The results of field trials showed that 82% of students achieved KKM so that more than 80% of students were complete in learning triangles and rectangles, so that online teaching materials were geometry materials for junior high school with a project-based approach. Learning assisted by Wingeom software is effectively used. This research produces mathematics teaching materials in the form of lesson plans and online learning worksheets that are valid, practical and effective.

Pengembangan Bahan Ajar Daring Pada Materi Geometri SMP dengan Pendekatan Project Based Learning Berbantuan Software Wingeom