A geometria do disco de Poincaré

Abstract

In this work, we discuss the history of non-Euclidean geometries, emphasizing a model of hyperbolic geometry in the plane: the Poincaré disk. We relate some results in this geometry to results from Euclidean geometry, such as the sum of the internal angles of a triangle, the area of a triangle, the Pythagorean theorem and the laws of sines and cosines. We also use a dynamic geometry software, GeoGebra, to build tessellations on the Poincaré disk. We conclude that GeoGebra is an efficient tool to approach hyperbolic geometries in the plane.