Jurnal Elemen Vol. 1 No. 2, Juli 2015, hal. 81 - 92 81 PENGEMBANGAN BAHAN AJAR BERBASIS CABRI 3D MATERI DIMENSI TIGA KELAS X SMA Drajat Friansah 1 , Zulkardi 2 , Somakim 2 1,2 Universitas Sriwijaya dfriansah49@gmail.com Abstrak Penelitian ini bertujuan untuk (1) menghasilkan bahan ajar berbasis Cabri 3D materi Dimensi Tiga yang valid, praktis, mempunyai efek potensial terhadap hasil belajar siswa serta menjelaskan proses pengembangannya, (2) mendeskripsikan karakteristik bahan ajar berbasis Cabri 3D materi Dimensi Tiga. Dalam mengembangkan bahan ajar, peneliti melalui tahap preliminary dan prototyping dengan alur formative evaluation. Pada tahap prototyping peneliti melibatkan siswa kelas X SMA Xaverius Lubuklinggau. Teknik pengumpulan data yang digunakan adalah dokumentasi, walk through, dan hasil tes. Penelitian ini menghasilkan bahan ajar berbasis Cabri 3D materi Dimensi Tiga yang valid dan praktis, dan mempunyai efek potensial terhadap hasil belajar siswa. Kevalidan bahan ajar ditinjau dari kesesuaian dengan kurikulum dan hasil validasi pakar serta uji prototipe pada tahap small group. Efek potensial dari bahan ajar ini terlihat dari kemampuan siswa menentukan kedudukan, jarak dan sudut unsur-unsur bangun ruang. Hasil evaluasi belajar menunjukkan kategori nilai 3,13% baik sekali, 56,25 Baik, 34,38 Cukup, dan 6,25 Kurang. Dari hasil pengamatan tidak terstruktur selama proses pembelajaran siswa memiliki inisiatif belajar dan memanfaatkan sumber-sumber belajar. Kata kunci: bahan ajar, Cabri 3D, dimensi tiga Abstract This study aims to (1) produce teaching materials based Cabri 3D material Three Dimensrions which is valid, practical, has a potential effect on the achievement of learning and explain the process of development, (2) describe the characteristics of teaching materials based Cabri 3D material Three Dimensions. In developing teaching materials, researchers through the preliminary stage and prototyping with groove formative evaluation. In the prototyping stage researchers involved class X SMA Xavierus Lubuklinggau. Data collection techniques used are documentation, walk-throughs, and the results of the test. This research-based teaching materials Cabri produce 3D material Three Dimensions valid and practical, and has a potential effect on the achievement of learning and self-sufficiency indicators of student learning. Validity of instructional materials in terms of compliance with the curriculum and the results of expert validation and test prototypes at the stage of a small group. The potential effect of this teaching material visible from the ability of students determines the position, distance and angle of the elements of geometry. The results of the evaluation study shows 3.13% category excellent value, 56.25 Good, 34.38 Enough, and 6.25 Less. From the observation unstructured during the learning process of students have the initiative to learn and utilize learning resources. Keywords: teaching material, Cabri 3D, three dimensions