This study aimed to implement a didactic situation design to overcome learning obstacles
in the circumference and area of the circle. The method used is qualitative research with
Didactical Design Research which goes through the last two stages, namely metapedadidactic analysis and retrospective analysis. The instrument used is a didactic situation
design prepared by Rosita, Maharani, Tonah & Munfi (2020) and interview guidelines.
Based on the implementation results, the didactic situation that has been designed has not
been able to overcome students' learning obstacles fully. In addition, a new learning obstacle appears in the concept of the circumference of a circle. Not all students can measure
the length of the curvature of a circle because there are inaccurate measurement results.
In this study, the didactic design was revised regarding the circumference and area of a
circle based on metapedadidactic and retrospective analysis.