A line is the path of one point moving. A line has length but no width. A line is a type of geometric figure.
Straight and curved linesEdit
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 the line 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 and 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 distinct points, named and , then the line can be called either , or .
Sometimes, lines are also named with just one symbol. In which case, a letter such as might be used.
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.
- ↑ "Compendium of Mathematical Symbols". Math Vault. 2020-03-01. Retrieved 2020-08-16.
- ↑ Weisstein, Eric W. "Line". mathworld.wolfram.com. Retrieved 2020-08-16.
- ↑ "An introduction to geometry (Geometry, Points, Lines, Planes and Angles)". Mathplanet. Archived from the original on 2020-09-29. Retrieved 2020-08-16.