Spherical geometry

Spherical geometry

Category. The right-angled spherical triangle

NAKED RULE

If the cathetus a is replaced (90° — ∝), the cathetus b through
(90° — b) and doesn't count the right angle, so applies:

The cosine of any piece is equal to the product of the cotangents of the adjacent pieces and equal to the product of the sines of the non-adjacent pieces.

B. The general spherical triangle