<![CDATA[ABSTRACT The difficulty of elementary school students in visualizing three-dimensional objects drives the need for more concrete geometry instructional materials. This study focuses on developing an Augmented Reality (AR)-based geometry learning module and evaluating its feasibility based on established aspects in the development process. A Research and Development (R&D) approach was implemented using the ADDIE framework (Analysis, Design, Development, Implementation, Evaluation) at SD Negeri 6 Air Kumbang. Feasibility evaluation relied on questionnaire instruments administered to 3 expert validators and real users consisting of 1 fifth-grade teacher and 19 students. Based on empirical data recapitulation, expert testing yielded an average validation score of 88.4%, categorized as highly valid. Regarding operational dimensions, practicality ratings reached 87.96% from teacher responses and 89.14% from student feedback, both classified as highly practical. These findings confirm that integrating print materials with AR digital projections meets validity and usability criteria in the classroom. Consequently, this module is ready to serve as a supplementary learning tool for fifth-grade solid geometry, while examining its impact on learning achievements and spatial skills remains an agenda for future research. ABSTRAK Kesulitan siswa sekolah dasar dalam membayangkan objek tiga dimensi mendorong perlunya inovasi bahan ajar geometri yang lebih konkret. Penelitian ini berfokus menghasilkan modul pembelajaran geometri berbasis Augmented Reality (AR) serta menilai kelayakannya berdasarkan aspek yang ditetapkan dalam proses pengembangan. Pendekatan Research and Development (R&D) dijalankan memakai alur ADDIE (Analysis, Design, Development, Implementation, Evaluation) di SD Negeri 6 Air Kumbang. Evaluasi kelayakan mengandalkan instrumen angket yang disodorkan kepada 3 orang validator pakar serta pengguna riil yang mencakup 1 orang guru kelas V dan 19 orang peserta didik. Berdasarkan rekapitulasi data empiris, pengujian oleh para pakar menghasilkan angka rata-rata validasi sebesar 88,4% dengan predikat sangat valid. Dari dimensi pengoperasian, penilaian kepraktisan mencapai 87,96% menurut respons pendidik dan 89,14% berdasarkan tanggapan para siswa, yang keduanya tergolong sangat praktis. Temuan ini mengonfirmasi bahwasanya integrasi materi cetak dan proyeksi digital AR telah memenuhi kriteria keabsahan serta kemudahan penggunaan di kelas. Dengan demikian, modul ini siap dimanfaatkan sebagai media pendukung materi bangun ruang kelas V, sedangkan pengujian dampaknya terhadap capaian belajar maupun kecakapan spasial menjadi agenda bagi riset selanjutnya.]]>
