DEVELOPING INSTRUCTIONAL MATERIALS OF TANGENTS TO TWO CIRCLES USING MULTIMEDIA WITH PMRI APPROACH IN 8TH GRADES

摘要

This study aims to develop instructional materials in the form of tangents to two circles student worksheet and multimedia PowerPoint with PMRI approach which categorized valid, practical and have a potential effect on students' understanding of internal and external tangents concept in 8th grades of Senior High School 6 Kayuagung. The study consisted of two stages are preliminary and formative evaluation. In the preliminary stages performed analysis and design instructional materials according to characteristics and principles of Realistic Mathematics Education in Indonesia (PMRI). In the formative evaluation stages performed expert review, one to one, small group, and field test. Field test conducted in 8.2th grades of Senior High School 6 Kayuagung which class consisting of 33 students. Based on the analysis of the test is known that most students are having good concept understanding. Then also obtained the results of observational analysis of students’ activity based on characteristics PMRI which are students active learning. It is identified that the instructional materials of tangents to two circles using multimedia with PMRI approach that has been developed meet the criteria valid, practical and effective.ududKeywords: instructional materials, multimedia, pmri approach, tangents to two circlesud