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Our earth spin around its axis every day. This movement causes days and nights.
The phenomenon of moving about a centre is called rotation.
Rotation:
An object is said to be rotating when it moves about its axis, making a \(360\)\(°\)movement. That is, when an object moves from a position, it takes a complete \(360\)\(°\) shift and comes back to the same position.
While rotating the objects take angular shifts.
Example:
Let us look at the following example.
In the example given below, we aim to make the object get back to the origin of its rotation.
![1.PNG](https://resources.cdn.yaclass.in/431171f8-7a9d-4282-b265-9f5006c31cf5/1w658.png)
In the above example, the blue line makes a \(90\)\(°\) shift during each rotation.
The process of rotation begins at the origin. At the end of \(4\) successful \(90\)\(°\) shifts, the blue line gets back to the source of its rotation.
The four \(90\)\(°\) shifts complete a whole \(360\)\(°\) rotation.
\(90\)\(°\) \(+\) \(90\)\(°\) \(+\) \(90\)\(°\) \(+\) \(90\)\(°\) \(=\) \(360\)\(°\)
In other words, an object would take a complete \(360\)\(°\) rotation to get back to its source of rotation.