# What is a Straight Line?

Any line which is not curved or vent can be considered as a straight line. A straight line may extend to infinity having no curves and bents. It can be formed between any two points extending to infinity. A __straight line__ may have no definite or fixed ending, you may have observed a railway line or a freeway, these might be considered as a straight line. Having said that, you should also remember that a straight line extends to infinity, thus any example which has a limitation may not be a straight line. In this article, we may try to cover some interesting facts and do a brief analysis of a straight line.

**Types Of Straight Lines **

There are various types of straight lines, but some of them are considered to be one of the most significant while doing the calculations about straight lines. The following points below analyses the types of Straight lines in a detailed manner;

- Any line which is parallel to the x-axis and perpendicular to the y-axis, then these are considered as a horizontal line. As it is one of the types of straight lines, every property will be similar to that of straight lines. Usually, horizontal lines form a degree of 0 or 180 parallel to the x-axis and 90 or 270 degrees with the y axis.
- Any angle which has been drawn vertically and is parallel to the y-axis and perpendicular to the x-axis, then these lines are considered as vertical lines. The properties of a vertical line will be similar to that of a straight line as it is one of the types of it. The vertical lines form a degree of 0 or 180 with respect to the y-axis and a degree of 90 or 270 with respect to the x-axis.
- Any other angle that is not horizontal or vertical is defined as slanted or oblique straight lines. These lines are formed at a slanting position. Angles except for 0 degrees, 90 degrees, 180 degrees, 360 degrees are considered slanting or oblique lines.

**Perpendicular Line **

The formation of a line due to the connection of two lines at a right angle which measures about 90 degrees is known as a __perpendicular line.__ The term perpendicularity is given for this formation or you can say the property of lines. These lines always intersect with each other, having said that you must not forget that every line which is intersecting is not a perpendicular line. If in the same line, two parallel lines must be parallel to each other and must not intersect as well. Have you ever observed the corner of two walls, these walls are perpendicular lines.

**Parallel Lines Vs Perpendicular Lines**

In the above passage, we studied the perpendicular lines that they are lines that intersect with each other at a point. In the next paragraph, we may carry out the comparison between parallel and perpendicular lines. The following points bring out the differentiating points between them;

- Parallel lines can be defined as the lines that will never- ever intersect each other at any point, also the distance between them always remains the same. On the other hand, perpendicular lines can be defined as a line that intersects with each other at a single point, also the distance between them remains the same.
- The symbol used to represent or express the parallel lines is ‘l l’ whereas the symbol used to signify the perpendicular lines is ⊥.
- Have you ever observed a rectangle seeing its opposite sides, this is one of the examples of parallel lines. On the other hand, the corner of the walls can be said as an example of a perpendicular line.

If you want to learn about straight lines in a detailed manner, in a fun way, and in an interactive manner, you should visit the website of Cuemath and understand math the Cuemath way.