one-dimensional infinite non-curved geometric object From Wikipedia, the free encyclopedia

A **line** is the path of one point that is moving. A line is a type of geometric figure. A line has length, but no width. A line is made up of an endless number of points.

A line can be straight or curved. In geometry, the word *line* means a *straight line*. A straight line is the shortest distance between two points. A straight line is traced by a point moving in a direction that does not change.

A *curved line* is sometimes called a curve. The edge of a circle is not straight. It is an example of a curve.

A *line segment* is part of a line. Here are examples of straight line segments:

- _____ __

Lines can get their names from any two points on the line. For example, if a line contains two different points, named and , then the line can be called either , or .

Sometimes, lines are named with just one symbol. A letter such as might be used.^{[1]}^{[2]}^{[3]}

Two lines can be:

- Parallel: Two lines are parallel if they are on the same plane and they never touch.
- Concurrent: Two lines are concurrent if they touch on one point.
- Coincident: Two lines are coincident if they are made of the same points.
- Perpendicular: Two lines are perpendicular if they make four right angles where they touch.
- Skew: In Euclidean space, two lines are skew if they are not parallel but they never touch.

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