Concurrent
Two or more Lines are said to be concurrent if they intersect in a single point. Two Linesconcur if their Trilinear Coordinates satisfy
 | (1) |
 |  |  | (2) |
 | | | (3) |
 | |  | (4) |
in which case the point is
 | (5) |
 | | | (6) |
 | | | (7) |
 | |  | (8) |
are concurrent if their Coefficients satisfy
 | (9) |
- Sphere with Tunnel
- Spherical Bessel Differential Equation
- Spherical Bessel Function
- Spherical Bessel Function of the First Kind
- Spherical Bessel Function of the Second Kind
- Spherical Bessel Function of the Third Kind
- Spherical Cap
- Spherical Coordinates
- Spherical Design
- Spherical Excess
- Spherical Frustum
- Spherical Geometry
- Spherical Hankel Function of the First Kind
- Spherical Hankel Function of the Second Kind
- Spherical Harmonic
- Spherical Harmonic Addition Theorem
- Spherical Harmonic Closure Relations
- Spherical Harmonic Tensor
- Spherical Helix
- Spherical Point System
- Spherical Polygon
- Spherical Ring
- Spherical Sector
- Spherical Segment
- Spherical Shell