S. Prabawanto, E. Mulyana
The research was aimed to develop a lesson design so that students' triangle conceptual understanding could be achieved. The method that be used in this research was qualitative with applied didactical design research (DDR). The DDR consisted of three main stepts, namely prospective analysis, metapedadicdactic analysis, and retrospective analysis. From the three stepts above, it was gained the empirical lesson design of triangle topic. The reseach results are: (1) there were some learning obstacles of students deal with the triangle topic, namely ontogenical, epietimological, and didactical obstacles; (2) implementaion of the lesson was conducted under three main stepts, namely action, formulation, and validation. For answering weather the design can be applied to other group of students, it was recommended that it cound be investigated by doing advanced reseach. © Published under licence by IOP Publishing Ltd.
Departemen Pendidikan Matematika, Universitas Pendidikan Indonesia, Bandung, Indonesia
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