Horizontal Line – Definition with Examples

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What is a Horizontal Line?

Imagine you have a paper, and someone asks you to draw a line. What all possibilities do you think will cross your mind? Well; there are a few ways you could do this.

If you were bored; you would most probably just end up drawing a random motion like this; called a skew line.

skew line - SplashLearn

And if you wanted to think like a mathematician or an artist; you would imagine a tree or something standing and draw a line top to bottom like this; called a vertical line.

vertical line - SplashLearn

Or you could think of a car or something lying down and sketch your line from left to right like this; called a horizontal line.

horizontal line - SplashLearn

A horizontal line is a sleeping line. It is a straight line that goes from left to right or right to left. The word horizontal is derived from the word “horizon” which is the line where the earth and sky appear to be meeting far far away. 

Horizontal Lines around Us

We see horizontal lines all around us in shapes, objects, figures, and drawings. 

Here are some examples of horizontal lines. 

Horizontal lines in objects:

horizontal lines in objects - SplashLearn

Horizontal Lines in Math:

Horizontal lines are the building blocks of so many 2D and 3D shapes in elementary geometry. Squares, Triangles, Rectangles, Cubes, Trapezoids, Prism are just some basic examples of shapes where we can observe horizontal lines.

horizontal lines in math - SplashLearn

Horizontal lines in Coordinate Plane

In coordinate geometry, horizontal lines are defined as lines parallel to the x-axis. If two points on a line have the same y-coordinate points then the line is said to be horizontal.

In the given image AB is a horizontal line parallel to the x-axis and if you observe carefully the y-coordinate of both points A and B are the same. Another interesting this to note about the horizontal lines is that they are always perpendicular to the vertical lines.

Horizontal lines in Coordinate Plane - SplashLearn

Drawing horizontal line

Using a Ruler:

To draw a horizontal line using a ruler, keep the ruler in sleeping position, parallel to the edge of the page and draw the line from left to right or right to left. 

Drawing horizontal line using ruler - SplashLearn

To draw a horizontal line on a coordinate plane

Follow these steps

  • Plot any point on the coordinate plane, for example, (1, 2).
  • Identify the y-coordinate of the point marked. Here, it is 2.
  • Plot another point on the coordinate plane such that its y-coordinate is the same as the previous point plotted. For example, (–5, 2).
  • Join the two points plotted using a ruler to get a horizontal line. 
steps to draw horizontal line on coordinate plane - SplashLearn

Uses of Horizontal Lines

Horizontal lines are used in symmetry and photography. 

A horizontal line of symmetry runs across the image from left to right (or vice versa) and divides the image into identical halves. 

horizontal lines used in symmetry - SplashLearn

Cameras are designed to take photographs in landscape (horizontal) or portrait (vertical) mode. In horizontal mode, photographs are wider than they are tall. In vertical mode, photographs are taller than they are wide. Our eyes see the surrounding horizontally giving a wider view instead of taller.

landscape (horizontal) - SplashLearn
portrait(verticaal) - SplashLearn

Horizontal Line and Vertical Line

Horizontal LineVertical Line
It is a sleeping line that goes from left to right or vice versa. It is a standing line that goes from top to bottom or vice versa.
It is parallel to the x-axis. It is parallel to the y-axis.
It is perpendicular to the y-axis.It is perpendicular to the x-axis. 

Solved Examples 

Example 1: Which line segments represent horizontal lines?

horizontal line in square - SplashLearn

Solution:

Lines BC and AD are horizontal lines.

Example 2: Identify the lines indicated by the arrows in each of the following shapes.

Identify the lines indicated by the arrows - SplashLearn

Solution:

  1. Horizontal line
  2. Vertical line
  3. Horizontal line
  4. Vertical line

Example 3: Identify the horizontal lines in the given shape.

identify the horizontal line in given image - SplashLearn

Solution:

AB, EF, and CD are the horizontal lines in the given shapes.

Example 4: Name five English alphabets that have horizontal lines.

Solution:

E, F, H, L, T

Practice Problems

Horizontal Line

Attend this Quiz & Test your knowledge.

1Which one of the following is the horizontal line?

AA
BB
CC
DD
CorrectIncorrect
Correct answer is: A
A horizontal line is a sleeping line.
Horizontal Line – Definition with Examples

2How many horizontal lines does the given figure have?

Horizontal Line – Definition with Examples
1
2
3
4
CorrectIncorrect
Correct answer is: 3
There are 3 straight lines that go from left to right or right to left
Horizontal Line – Definition with Examples

3At what time the minute hand of a clock will be horizontal?

12 o’clock
Quarter past 12
Half past 12
12:40 pm
CorrectIncorrect
Correct answer is: Quarter past 12
At a quarter past 12 minutes hand will be at 3. So, the minute hand will be horizontal.

Frequently Asked Questions

A horizontal line is a straight line that is parallel to the x-axis and where all the points on the line have the same y-coordinate.

Yes, all horizontal lines are parallel to each other. Horizontal lines when extended also never intersect with one another.

Horizontal lines are lines that run from left to right and are parallel to the x-axis. Vertical lines are lines that run up and down and are parallel to the y-axis.


Horizontal Line – Definition with Examples

Shapes

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Horizontal Line – Definition with Examples

Angles

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Horizontal Line – Definition with Examples

Parallel and Perpendicular Lines

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