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.
Straight and curved lines
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.
Line segments
A line segment is part of a line. Here are examples of straight line segments:
- _____ __
Naming lines
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
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.
Related pages
References
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