Pengembangan Perangkat Pembelajaran Berbantuan GeoGebra pada Materi Lingkaran SMA Berdasarkan Model van Hiele untuk Meningkatkan Hasil Belajar Matematika

Abstract

This study aimed to develop GeoGebra-assisted learning devices on circle geometry based on the van Hiele model that fulfill the criteria of validity, practicality, and effectiveness in improving students’ mathematics learning outcomes. The study employed a Research and Development (R&D) approach using the 4D model, consisting of the Define, Design, Develop, and Disseminate stages. The participants were twelfth-grade high school students. The developed products included teaching modules, student worksheets, a user guidebook, and learning achievement tests. Data were collected through expert validation sheets, observation sheets, readability questionnaires, student response questionnaires, and learning outcome tests. The findings revealed that the developed learning devices were valid, with average validity scores ranging from 3.58 to 3.85 on a four-point scale. The practicality of the devices was indicated by a high level of instructional implementation (3.75), very high student activity (93.2%), and highly positive student responses (92.68%). Furthermore, the devices were proven effective, as indicated by a classical mastery percentage of 89%, a high N-Gain score of 0.77, and the significant difference in pre-post test achievement in the experimental group (p < 0.05). These findings indicate that GeoGebra-assisted learning devices based on the van Hiele model are effective in improving students’ mathematics learning outcomes in circle geometry learning.