Development of mathematical learning devices based on multimedia on circle materials of grade eighth of junior high school

This study aims to develop multimedia-based mathematical learning tools that are valid and practical in circle material. Learning tools developed are Lesson Plan, Teaching Materials and Student Worksheets. This type of research is development research that uses a 4-D (Four-D) development model developed by Thiagarajan and consists of 4 stages namely define, design, development, and dissemination, but due to time constraints, it is only limited to the development stage. The research subjects were seventh-grade junior high school students at the Angkasa Lanud Pattimura Ambon. The results of the study show that the learning devices developed are valid and practical. This is indicated by the general average validator rating for the three devices is 3.44; practicality of learning 92.98% and mastery of students taught by using the results of the development of 71.42%