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My grandson, Jos, was curious about Geometrica. I explained a few things, and we agreed to survey special lines called perpendicular bisectors or, more usually, bisectors in a triangle. First, we learned how to call Geometrica, then to draw a triangle and determine step by step the bisectors of the triangle. We finished with the circumcircle of a triangle. The naive questions asked by my grandson shed light on the basic concepts of both Mathematica and Geometrica. This notebook illustrates the entire process.
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