E-ISSN : 2579-9258 Jurnal Cendekia: Jurnal Pendidikan Matematika P-ISSN: 2614-3038 Volume 05, No. 01, Maret 2021, pp. 759-769 759 Pengembangan Bahan Ajar Daring Pada Materi Geometri SMP dengan Pendekatan Project Based Learning Berbantuan Software Wingeom Risma Amelia 1 , Siti Chotimah 2 , Diana Putri 3 1, 2, 3 IKIP Siliwangi, Jl. Terusan Jenderal Sudirman Cimahi rismaamelia@ikipsiliwangi.ac.id Abstract 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. Keywords: Development, Teaching materials Online Learning, Geometry, Project Based Learning, Software Wingeom Abstrak Penelitian ini bertujuan untuk mengembangkan bahan ajar daring materi geometri SMP dengan pendekatan project based learning berbantuan software wingeom yang memenuhi kriteria valid, praktis dan efektif. Jenis penelitian ini yaitu penelitian pengembangan (R&D), dengan 5 tahapan utama yaitu: (1) Studi pendahuluan; (2) Desain bahan ajar; (3) pengembangan (validasi ahli, ujicoba, revisi); (4) Implementasi; (5) Evaluasi. Subjek dari penelitian ini yaitu siswa SMP di kota Cimahi, dengan sampel sebanyak 35 siswa kelas VII. Penelitian dilaksanakan pada semester genap mengenai materi geometri yaitu segiempat-segitiga. Aspek yang dinilai dari pengembangan bahan ajar tersebut yaitu menghasilkan bahan ajar yang valid, praktis, dan efektif digunakan pada pembelajaran daring. Kevalidan bahan ajar dilihat dari hasil 5 validator yang mencapai kriteria valid dengan kategori sangat baik, Kepraktisan bahan ajar mencapai kriteria praktis ditinjau dari lembar kepraktisan guru dan siswa. dan keefektifan bahan ajar ditinjau dari pencapaian ketuntasan belajar siswa. Hasil ujicoba lapangan diperoleh hasil 82% siswa mencapai nilai KKM sehingga lebih dari 80% siswa tuntas dalam mempelajari materi segiempat dan segitiga, sehingga bahan ajar daring materi geometri SMP dengan pendekatan project based learning berbantuan software wingeom efektif digunakan. Penelitian ini menghasilkan bahan ajar matematika berupa RPP dan LKS pembelajaran daring yang valid, praktis dan efektif. Kata kunci: Pengembangan, Bahan Ajar Daring, Geometri, Project Based Learning, Software Wingeom Copyright (c) 2021 Risma Amelia, Siti Chotimah, Diana Putri  Corresponding author: Junitasari Email Address: rismaamelia@ikipsiliwangi.ac.id (Jl. Terusan Jenderal Sudirman Cimahi) Received 22 Desember 2020, Accepted 13 Februari 2021, Published 27 Maret 2021 PENDAHULUAN Di Indonesia wabah virus corona masuk pada awal maret 2020 dengan penyebarannya yang sangat cepat, pada saat itu WHO menetapkan Covid-19 sebagai pandemi global. Sektor pendidikan merupakan salah satu yang terdampak akibat pandemi ini, proses belajar mengajar di sekolah dengan cara tatap