Dissection of Gerwien's Triangle into a Saccheri Quadrilateral on the Sphere

http://demonstrations.wolfram.com/DissectionOfGerwiensTriangleIntoASaccheriQuadrilateralOnTheS The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily. This Demonstration shows Gerwien's dissection of a spherical triangle into a spherical Saccheri quadrilateral. Two cases are treated, namely that from Figures 1 and 3 from Gerwien's 1833 article [1]. Contributed by: Izidor Hafner Audio created with WolframTones: http://tones.wolfram.com

Видео Dissection of Gerwien's Triangle into a Saccheri Quadrilateral on the Sphere автора Арифметический парадокс