Spherical

Been thinking it would be nice to add a colored triangle to the surface
of a sphere. So far:

from Wolfram Mathworld:

from Grapher

Grapher Primitives:

Omitting considering sint values:

Only doing a half of the y axis values:

Spherical Easel Download:

I should be able to - with spherical geometry and its formulas - draw

a triangle with arcs as sides, and fit it 'manually' to my Grapher sphere.

* * *

Grapher, add amended copy:

(Note on the original sphere, the values in brackets give the origin; the *2, the relative size.)

* * *

Getting the hang of it!