1. Right Line -- from MathWorld - Weisstein, Eric W.
See: Line.

2. Straight Line -- from MathWorld - Weisstein, Eric W.
See: Line.

3. Map of the Shore Line Rail Road route between New York and Boston, showing its rail road and steamboat connection with New York, New Haven, New London, Stonington, Providence, Newport, and Boston. - Walling, Henry Francis, 1825-1888.; Shore Line Railroad.; H.F. Wallings Map Establishment.
Detailed map of lower New England states and part of New York indicating drainage, cities and towns, state boundaries, township lines, and the railroad network.

4. Isopolar Line -- from MathWorld - Weisstein, Eric W.
See also: Isopole, Orthopolar Line.

5. Coincident Lines -- from MathWorld - Weisstein, Eric W.
Two lines that lie on top of one another are called coincident lines.

6. Line-Line Angle -- from MathWorld - Weisstein, Eric W.
For two line in the plane with endpoints (\mathbf{x}_{1},\mathbf{x}_{2}) and (\mathbf{x}_{3},\mathbf{x}_{4}), the angle between them is given by \cos\theta = {(\mathbf{x}_{2}-\mathbf{x}_{1})\cdot(\mathbf{x.

7. Intersecting Lines -- from MathWorld - Weisstein, Eric W.
Lines that intersect in a point are called intersecting lines.

8. Map showing the Iowa & Missouri State Line Railroad and its connections. - G.W. & C.B. Colton & Co.; Iowa & Missouri State Line Railroad.
Township and county map of the northern United States showing drainage, cities and towns, and the railroad network emphasizing the main line.

9. Imaginary Line -- from MathWorld - Weisstein, Eric W.
A "line" having imaginary coefficients in its equations which can arise in algebraic geometry.

10. Transversal Line -- from MathWorld - Weisstein, Eric W.
A transversal line is a line which intersects each of a given set of other lines.

11. Line Bisector -- from MathWorld - Weisstein, Eric W.
The line bisecting a given line segment P_1P_2 can be constructed geometrically, as illustrated above.

12. Map of the Iowa Central Air Line Rail Road and its connections. - J.H. Colton & Co.; Iowa Central Air Line Railroad.
Detailed township map of the north-central states indicating drainage, cities and towns, townships, county boundaries, the road and railroad networks, and in blue overprint the connections with the Iowa Central line.

13. Line -- from MathWorld - Weisstein, Eric W.
A line is a straight one-dimensional figure having no thickness and extending infinitely in both directions.

14. Secant Line -- from MathWorld - Weisstein, Eric W.
A secant line, also simply called a secant, is a line passing through two points of a curve.

15. Isoclinal Line -- from MathWorld - Weisstein, Eric W.
A line making equal angles with the edges of a trihedron is called an isoclinal line of the trihedron.

16. Orthogonal Lines -- from MathWorld - Weisstein, Eric W.
Two or more lines or line segments which are perpendicular are said to be orthogonal.

17. Orthopolar Line -- from MathWorld - Weisstein, Eric W.
The orthopoles of a line l with respect to the four triangles formed by three out of four vertices of any quadrilateral ABCD lie on a straight line L known as the orthopolar line of l for the given quadrilateral (Servais 1923, McBrien 1942, Goormaghtigh 1947).

18. Line Segment -- from MathWorld - Weisstein, Eric W.
A closed interval corresponding to a finite portion of an infinite line.

19. Centroidal Line -- from MathWorld - Weisstein, Eric W.
The three planes determined by the edges of a trihedron and the internal bisectors of the respectively opposite faces are coaxal, and the common line of these planes is called the centroidal line.

20. Radial Line -- from MathWorld - Weisstein, Eric W.
A line that passes through the center of a circle or sphere.

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