Geometric constructions present an opportunity to help students develop geometric proofs and justifications while actively creating mathematical representations (Mariotti, 2001). Though traditionally carried out with paper and pencil, dynamic geometry software allows students to produce more precise constructions with greater certainty (Kondratieva, 2013). In this Construct It! activity, students must construct the circumcenter of a triangle and then justify that it is equidistant from all three vertices of the triangle. Students were given three different attempts to do this, each with different resources: physical materials, compass and ruler, and dynamic geometry software. On each attempt, they became increasingly precise in their ability to both locate the circumcenter and justify their reasoning.