Development of Appy Pie Learning Media Based on Metacognitive Approach for Mathematical Reflective Thinking Ability in Geometry

This research aims to produce appy pie learning media based on a metacognitive approach to mathematical reflective thinking skills that are appropriate for use in geometry. Feasibility of learning media in terms of validity, practicality, and effectiveness. The research method used is the Research and Development (R & D) method with ADDIE Model, namely Analysis – Design – Development – Implementation – Evaluation. In the implementation stage, on media trial step, the One-Shot Case Study type pre-experiment design research method was used. Based on the results of validation, the learning media is categorized very well with a validity percentage of 85.66%. Based on the results of the student response questionnaire, the learning media is categorized well with a practicality percentage of 84.12%. Based on the results of the test of mathematical reflective thinking ability, the learning media was declared effective with the percentage of students who got a value of ≥ 70 of 79.16%. Thus, appy pie learning media based on a metacognitive approach to mathematical reflective thinking skills is declared feasible on geometry.