# Lines

A **line** has one dimension:** length**.

They are designated by two points or a lowercase letter.

**Two points determine a line.**

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

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

#### Parallel Lines

Two **parallel lines** do not intersect at any point.

#### Coincidental Lines

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

#### Perpendicular Lines

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

# Ray

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

Subject

Site