Parallel
Two lines in 2-dimensional Euclidean Space are said to be parallel if they do not intersect. In 3-dimensionalEuclidean Space, parallel lines not only fail to intersect, but also maintain a constant separation between pointsclosest to each other on the two lines. (Lines in 3-space which are not parallel but do not intersect are called SkewLines.)
In a Non-Euclidean Geometry, the concept of parallelism must be modified from its intuitive meaning. This isaccomplished by changing the so-called Parallel Postulate. While this has counterintuitive results, the geometriesso defined are still completely self-consistent.
See also Antiparallel, Hyperparallel, Line, Non-Euclidean Geometry, Parallel Curve,Parallel Postulate Perpendicular, Skew Lines- Diagonal Slash
- Diagonal (Solidus)
- Diagonals Problem
- Diagram
- Diameter
- Diameter (General)
- Diameter (Graph)
- Diamond
- Dice
- Dichroic Polynomial
- Dido's Problem
- Diesis
- Diffeomorphism
- Difference
- Difference Equation
- Trigonometry Values Pi/4
- Trigonometry Values Pi/5
- Trigonometry Values Pi/6
- Trigonometry Values Pi/7
- Trigonometry Values Pi/8
- Trigonometry Values Pi/9
- Trigyrate Rhombicosidodecahedron
- Trihedron
- Trilinear Coordinates
- Trilinear Line