Fitri, N.L. and Prahmana, R.C.I. 2020. Designing learning trajectory of circle using the context of Ferris wheel. JRAMathEdu (Journal of Research and Advances in Mathematics Education). 5, 3 (Jul. 2020), 247–261. DOI:https://doi.org/10.23917/jramathedu.v5i3.10961.