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The aims of this research is to describe the process and outcomes of the development of learning equipment using the GeoGebra-assisted with scientific approach for common tangent of to two circles on 8th grade junior high school which is valid, practical, and effective. The process of developing learning equipment in this research use the Plomp model (2010) consisting of preliminary research phase by analyzing students’ needs and material analyzing, the second phase is prototyping that arranging learning equipment based of the result from the previous anlysis and the last phase is assessment by testing the result of the development of learning equipment. The learning equipment developed are Syllabus, Lesson Plan and Student Worksheet. Based on the results of the validation, the learning equipment meets the validity criteria with is 3,23 then the Syllabus is valid,     is 3,43 then the Lesson Plan is very valid and     is 3,22 then Student Worksheet is valid. The learning equipment meets the practicality criteria based on observations implementation with average score on the first day is 3,78 and the second day is 3,92 which is included in the excellent category. The effectiveness criteria are meets based on the results of the students' responses in the positive category is 85,2% and the results of the student learning test with the percentage of students completing classical learning in the high category is 81,25%. Based on the results of the analysis of these data, the result of this research is that the learning equipment using the GeoGebra-assisted scientific approach for common tangent of to two circles on 8th grade junior high school fullfilled the criteria of valid, practical and effective.

mathedunesa/mathedunesa: jurnal ilmiah pendidikan matematika

PENGEMBANGAN PERANGKAT PEMBELAJARAN MENGGUNAKAN PENDEKATAN SAINTIFIK BERBANTUAN GEOGEBRA PADA MATERI GARIS SINGGUNG PERSEKUTUAN DUA LINGKARAN UNTUK KELAS VIII SMP