Crucial Point
The Homothetic Center of the Orthic Triangle and the triangular hull of the three Excircles. It has Triangle Center Function
References
Kimberling, C. ``Central Points and Central Lines in the Plane of a Triangle.'' Math. Mag. 67, 163-187, 1994. Lyness, R. and Veldkamp, G. R. Problem 682 and Solution. Crux Math. 9, 23-24, 1983.
- Spherical Tessellation
- Spherical Triangle
- Spherical Trigonometry
- Spherical Vector Harmonic
- Spheroid
- Spheroidal Harmonic
- Spheroidal Wavefunction
- Sphinx
- Spider and Fly Problem
- Spider Lines
- Spiegeldrieck
- Spieker Center
- Spieker Circle
- Spigot Algorithm
- Spijker's Lemma
- Spindle Cyclide
- Spindle Torus
- Spinode
- Spinor
- Spiral
- Spiral Point
- Spira Mirabilis
- Spiric Section
- Spirograph
- Spirolateral