Abstract

Geometry is one of the important subject in mathematics. One of the objectives of learning geometry is the students can gain confidence about their mathematical abilities and be able to communicate mathematically. However, in their practices students are still having difficulty understanding geometric material and students’ mathematical communication skills are also still low. Considering the importance of geometry learning, the students’ mathematical communication ability need to be improved to achieve geometry leaning goals. In this study, geometry learning devices were developed based on the Van Hiele Theory with the purpose to produce a product consisting of lesson plan and students worksheet to develop students’ mathematical communication ability. The development model used is Model Plomp. Based on the results obtained in small group stage, there is increase in students’ mathematical communication ability seen from the result of working the questions every meeting. Then, an analysis the questionnaire of students who obtained practical category. So that, it can be conclude that geometry learning sets based don Van Hiele Theory practical can be used to increase Students Mathematical Communication Ability in Class VII Junior High School.

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