Pairs of Lines
Each type of pair of d-lines has a single object associated with it.
Two lines intersect in a unique point P1
Two parallel lines intersect in a point P2 on the boundary of the disc.
Two ultra parallel lines have a unique d-line D3 that is perpendicular to them both.
Angle of Parallelism
Saccheri Quadrilateral
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Saccheri Quadrilateral
Saccheri Quadrilateral
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