### UnivHypGeom25: Geometer's Sketchpad and circles in Universal Hyperbolic Geometry

We describe Geometer's Sketchpad (GSP): a dynamic software package that we use to illustrate constructions and measurements in universal hyperbolic geometry. Starting with basic properties of GSP, we then explain custom tools and how to make them. In particular we show how to construct the dual of a point, with respect to the standard null circle. For our main application, we illustrate various circles in hyperbolic geometry, both with centers inside the null circle, as well as center outside, in which case we get circles usually called equidistant curves.CONTENT SUMMARY: Introduction to Geometers Sketchpad? (GSP): @00:11 lecture start: @01:53; tools @2:39; menu_items @07:23; custom tools for hyperbolic geometry @10:55; constructing the dual of a point @12:49; circles in hyperbolic geometry @16:57; closing remarks @24:36 (THANKS to EmptySpaceEnterprise)

Length:
25:22