“…The design LIT is as follows: at the time before starting learning, the teacher should prepare learning material better by considering the aspects of students' spatial abilities, introducing the concept of geometric transformation using examples of everyday concepts, which have been known to students before, including using RME in accordance with Nuraida and Amam (2019), effective use of media, one example of the use of technology-based media. The use of technology-based learning media such as Cabri 3D and GeoGebra has been shown to improve students' spatial skills (Burte, Gardony, Hutton, & Taylor, 2017;Sack & Vazquez, 2011;Nurjanah, Latif, Yuliardi, & Tamur, 2020). Besides scaffolding by teachers, it is still necessary a validmeasurement so that students can achieve the expected learning trajectory (Confrey, Toutkoushian, & Shah, 2020).…”