A line is a one-dimensional figure, which has length but no width. A line is made of a set of points which is extended in opposite directions infinitely. A line can be defined as a straight set of points that extend in opposite directions. It has no ends in both directions(infinite). It has no thickness. It is one-dimensional. In Geometry, there are basically four types of lines. They are: Horizontal Lines Vertical Lines Parallel Lines Perpendicular Lines

Draw and label X Y ↔

A line is a set of points that can go in any direction, but it must be straight. A line does not end, so arrows are put at both ends to show that the line extends forever in two directions. A drawing of a line looks like this: Using symbols, this line is often represented as, X Y ↔ or Y X ↔ .

Draw and label K L ¯ .

A line segment is a part of the line that has two fixed endpoints. A drawing of a line segment looks like this: Using symbols this is often written as, K L ¯ or L K ¯ .

Draw and label P Q → .

A ray is a part of a line that has a fixed starting point and extends forever in other direction. A drawing of a ray looks like this: It has only one name, P Q → , because its name must begin with its starting point.