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Geometry is one of the important components in learning mathematics for higher education students especially during the COVID-19 pandemic. The object of this research was desribed a learning trajectory on geometry through web-based learning through Google Sites. The research method used design research type validation studies starting from preliminary design, teaching experiments, and retrospective analysis. The research by using the Pendidikan Matematika Realistik Indonesia (PMRI) approach. The subjects of this research are third semester students at one of the private universities in Indonesia. A hypothetical learning trajectory using Google Sites was developed by collecting data through documentation, interviews, and classroom observations. Data collection techniques in the form of interview sheets, questionnaires, and tests. The result of this research was local instructional theory on geometry through web-based learning through Google Sites that the web-based learning through helped students in higher education understand the concept of geometry.  The HLT was implemented in the classroom to investigate students’ actual learning trajectory in higher education.

Geometry, web-based learning, PMRI approach