¶ Spherical Triangle Sequence (3)
← Spherical Triangle Sequence (2) | Spherical Triangle Sequence →
RBF Definitions
“I’ll paint this green all around, a green area which is bound by a closed line of three edges and three angles. You say it doesn’t look like a triangle to me. And I say it √the outside green area-- EJA note.√ must be; that’s your definition of a triangle, an area bound by a closed line of three edges and three angles. Now the board being asymmetrical makes it more difficult for you for the moment, but I want you to think about our Earth. We had a circle which was an area bound by a closed line with equal radius from a point. Well, taking our Earth, I’m now going to make a closed line on it and it happens to be 90 degrees from each of the poles and you would call it the equator. It’s a closed line on the surface and it divides the Earth into a southern hemisphere and a northern hemisphere. You credit both sides of the line. Now I’m going to take you up to 80 degrees north latitude and draw a lesser circle. It divides the surface of the Earth into two areas: a very large souther one and a very small northern. We can just call it the Arctic circle and the rest of the Earth. But you don’t negate the rest of the Earth and you do recognize both sides of the line.”
¶ Citations
- SIMS Address, U.Mass., Amherst, Talk 13, p.17, 22 Jul’71
