Abstract
Radian is an angle measurement in which the students studied at trigonometry subject. Educational research showed that secondary school students were found lack of radian understanding. The students know how to convert radian to a degree and vice versa. However, they fail to understand what radian is and why there are two measurements of angle in trigonometry. In this study, we propose and describe a lesson design through constructing knowledge for high school students in radian understanding. We also report on the results of a classroom case study in which the lesson design had been implemented. This study used a phenomenological investigation based on interviews and classroom observations. We also discuss the task-related difficulties that students faced in their concept development and we describe their radian understanding in terms of our framework.
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