¶ Trigonometry
← Trigonometry | Trigonometry: Spherical Trigonometry →
Index Entry
Trigonometry:
"Plane geometry is only a vestigial, terminal case of spherical trigonometry. The ratio-ing of angles and edges on a presumed flat surface is a very special case. That’s why it seems so remote from experience. What is really being measured can be only central angles and spherical surface angles. That’s all there is.
“The central angles and surface spherical angles are those of the projection onto a sphere of the characteristics of polyhedra as projected from the centers of volume of the respective polyhedra.”
¶ Citations
- RBF to EJA a propos Ltr. from Hugh Kenner of 14 Jul’76; holograph, Washington DC, 18 Jul’76.
