Geometry is a very big maths domain and an important one as well. Geometry is a branch of mathematics that involves unit measurements, properties, and links between solids, angles, lines, points, and surfaces. In simple words, geometry is a domain that deals with surfaces, lines, points, and shapes. Before getting into complex shapes and figures, you need to learn the basics and what can be better than understanding the importance of lines. In this resource, you will learn what is a line and different types of lines.

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Let's go

What is a Line?

Let's do a small activity. Take a pencil and a paper. Place the nip of your pencil on the piece of paper and push it with the help of a ruler and stop at any point you want. You will see a straight pencil mark on that paper. That is called a line. Basically, a line is a distance between two points. You can also call it the length of two points. In some scenarios, you might not even see points. You will see a line that goes up to infinity, in this case, the points will be from positive infinity to negative infinity and vice versa. A line has one dimension and that is the length.

The basic concept of a line is the distance between two points but this doesn't end here, there are other concepts as well. One of them is the gradient, also known as slope. Furthermore, the direction of a line also matters. Not to mention the intercepts of lines.

Let's take a look at different types of lines.

Intersecting Lines

When two or more lines are cutting at a single point, we call them intersecting lines. The word intersection means two or more than two lines that are meeting at a single point.

Parallel Lines

If two are more lines doesn't intersect at any point and their angle from normal are the same, that means both lines are parallel lines. The angles of both angles should be the same, if they are not the same, even if they are not intersecting each other, then both lines will not be parallel lines.

Coincidental Lines

Imagine a line on another line like the one in the above diagram. These types of lines are called coincidental lines. Two or more lines are coincidental if all their points are common.

Perpendicular Lines

 

When two lines intersect each other but at an angle of , also known as right angle, that means they are perpendicular lines.

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

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Emma

Emma

I am passionate about travelling and currently live and work in Paris. I like to spend my time reading, gardening, running, learning languages and exploring new places.