Lines

A line has one dimension: length.

Line Segments

They are designated by two points or a lowercase letter.

Two points determine a line.

Line Direction

 

A line indicates two opposite directions, as it can be viewed from left to right or from right to left.

 

Types of Lines

Intersecting Lines

Intersecting Lines

 

Two lines that meet at a point are called intersecting lines.

 

Parallel Lines

Parallel Lines

 

Two parallel lines do not intersect at any point.

Coincidental Lines

Coincidental Lines

 

Two straight lines are coincidental if all their points are common.

Perpendicular Lines

Perpendicular Lines

 

 

Two lines are perpendicular when they intersect at right angles (90º).

 

Ray

Ray

 

A ray or half-line is part of a line that is finite at one point and infinite in the opposite direction.