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Triangle and quadrilateral material has been studied since the students are in elementary school, but the junior high school students still struggle to solve problems related to triangle and quadrilateral. The research method used in this research is a qualitative method with Didactic Design Research (DDR) approach. DDR is research conducted through three stages didactic situation analysis before learning which its form is Didactic Hypothesis Design, meta didactic analysis, and retrospective analysis. It's defined as an analysis which relates the result of didactic hypothesis analysis and the result of the meta didactic analysis. Based on the results of the analysis shows that learning by using didactic design in teaching triangle and quadrilateral, students can work through the completion of visual essential PowerPoint. Study and observation of the writers when learning takes place, the difficulties faced by students in solving the problem of mathematical creative ability is that students not usually used it for facing issues with indicators of the artistic knowledge of mathematics. So, in general, some students from both classes have depicted to the student's creativity in solving the problem, but there is no answer, and the level of thinking is low.
Rohaeti et al. (Fri,) studied this question.