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This research was implemented to students from the 4th grade and 7th grade in one of elementary and junior high schools around Bandung city. The initial problem that became a background of this research was the difference ability and learning experience of elementary and junior high school students when learning the area of triangle concept. So that the learning carried out should also be different according to the needs of students. The focus on this research was to develop the Hyphotetical Learning Trajectory (HLT) that is appropriate for the needs of elementary and junior high school students based on the results of teacher and students interview and learning observation. This research used the qualitative method in the form of a didactical design research through three phases of analysis that are prospective analysis, metapedadidactic analysis, and retrospective analysis, with the triangulation technique for collecting data. Based on the results and discussion of research, the learning trajectory for elementary students is concluding the triangle area formula based on concrete activities, while for junior high school students is proving the formula of the triangle area and applying it in more complex problems.