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) |
- Disdyakis Triacontahedron
- Disjoint
- Disjunction
- Disjunctive Game
- Disk
- Disk Covering Problem
- Disk Lattice Points
- Dispersion Numbers
- Dispersion Relation
- Dispersion (Sequence)
- Dispersion (Statistics)
- Disphenocingulum
- Disphenoid
- Dissection
- Dissection Puzzles
- Dissipative System
- Distance
- Distinct Prime Factors
- Distribution
- Distribution Function
- Distribution (Functional)
- Distribution Parameter
- Distribution (Statistical)
- Distributive
- Distributive Lattice