Hana Sekar Binri, Kana Hidayati
This study aims to produce a learning tool of plane geometry with Problem Based Learning model which oriented problem-solving abilities and to describe the quality of learning media in terms of validity, practicality, and effectiveness. The developed learning media that were developed consisted of the lesson plans and students' worksheets. The subjects of this study were 31 students of grade VIII Junior High School in Central Java. Research instruments whose validity measured are lesson plans and students' worksheets. As for the practical assessment measured using a questionnaire response of students and teachers. Assessment of effectiveness measured using the results of tests of problem-solving abilities. Based on the results of the validity assessment, the criteria of the developed lesson plans and students' worksheets was 'very good'. The developed learning media met the practical with the criteria of 'very good' from the teacher's questionnaire response and students' questionnaire responses. The developed learning media met, the effective criteria based on the results of the test of problem-solving ability. The percentage of students' mastery learning reached 87.10% with an average score of 84.13, which is 'very good'. © 2022 Author(s).
Department of Mathematics Education, Universitas Negeri Yogyakarta, Yogyakarta, Indonesia
