The Irish Times

Spherical geometry: Going around in great circles to get to the point

The shortest distance between two points is a straight line. This is one of the basic principles of Euclidean geometry. But we live on a spherical Earth, so we cannot travel the straight line path ...
insider.si.edu

Geometric Model by A . Harry Wheeler, Oblique Spherical Triangle

This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...
insider.si.edu

Geometric Model by A. Harry Wheeler, Quadrantal Spherical Triangle

This media is in the public domain (free of copyright restrictions). You can copy, modify, and distribute this work without contacting the Smithsonian. For more information, visit the Smithsonian's ...
Nature

“The Axioms of Geometry”

MR. ROBT. B. HAYWARD has written to me that some of the statements in my article, “The Axioms of Geometry,” in NATURE, March 13 (p. 453), are too sweeping, and that in particular Euclid I. 16 does not ...