# Parallel Lines Definition

In **Geometry**, some lines make shapes when connected. Similarly, some lines never join each other. **Parallel lines** are specific lines that **lie in the same plane** but never **touch** each other. These lines keep the **same distance** between them at **all points**.

**Note:**

You can read about Axis in Geometry here.

**Table of Contents**

- Everyday examples of Parallel lines
- Representation of Parallel Lines
- How to check if lines are parallel?
- What is the opposite of parallel lines?
- Fun Facts about parallel lines
- FAQ's

Parallel lines can be **horizontal** or **vertical**. The only condition is these lines can never touch each other even when drawn for hundreds of miles. The angle between parallel lines can either be **0 degrees** or **180 degrees** depending on the **direction** of those lines.

**Note:**

Read about Acute Angle here.

## Everyday examples of Parallel lines

- Zebra Crossing on the road.
- Lines on a notebook.
- Rails of the railway track
- Vertical polls of a football net

### Representation of Parallel Lines

Like all other quantities, Parallel lines are also represented in a specific way in Mathematics. To show parallel behavior between two lines, **two vertical lines** are **drawn** between the **names** of the lines. **For example**, if two lines **AB** and **CD** are **parallel**, we will write them as **AB || CD**.

### How to check if lines are parallel?

To check parallel behavior between two lines, you can follow **two methods**. Let us explain both of those methods here.

**Method 1:**

In this checking, you should have to measure the **distance** between those lines at **different points**. If the distance between drawn lines remains the **same**, it means that **those lines are parallel**. If the distance **doesn’t remain the same**, it means that those lines may be in the same plane but **never** be **parallel**.

**Method 2:**

The second method is by drawing a **“Transversal Line”** on both **parallel lines**. It is a particular line drawn **straight** that cuts the **two parallel lines** at any point. If all **external** and **internal angles** made from this new line on those lines are **same**, it means that those lines are **parallel**.

**Note:**

You can read about **Transversal Line** here.

### What is the opposite of parallel lines?

In Geometry, **Perpendicular lines** are considered to be opposite to Parallel lines. It is because these lines make an angle of **90 degrees**.

**Note:**

You can read about Perpendicular lines here.

### Fun Facts about parallel lines

- Parallel lines can
**never intersect**each other. - These lines have
**equal separation**at all points. - Parallel lines always lie in the
**same plane**. **Angles**drawn from a**transversal line**on parallel lines are**equal**to each other.- Parallel lines can have the
**same**as well as**opposite**directions. - The angle between parallel lines can be
**0 degrees**or**180 degrees**.

### FAQ's

**What is a parallel line definition?**

These are lines that are drawn in the same plane with the separation of equal measurement at all points.

**What are two examples of parallel lines in real life?**

Zebra crossing and lines on notebooks are examples of parallel lines.

**Can parallel lines intersect each other?**

No, parallel lines can never intersect each other.

**What is the opposite of parallel lines?**

The opposite of parallel lines is perpendicular lines.

**What is the angle between two parallel lines?**

The angle between two parallel lines can be 0 degrees or 180 degrees.

**How many parallel lines can we draw?**

We can draw unlimited parallel lines by following the above definition. Keep in mind lines are parallel only when they are equally apart from each other at all points.