Theory:

Types of angles of rotation:
 
1. Full rotation: A \(360°\) rotation
 
2. Half rotation: A \(180°\) rotation
 
3. Quarter rotation: A \(90°\) rotation
 
 
Look at the following figure.
 
1 Ресурс 1 (1).svg
 
 
How will the object look after a \(90\)\(°\) rotation?
 
The object takes a quarter rotation and the rotated figure looks like the following.
 
1(1) Ресурс 1.svg
 
 
How will the object look after a \(180\)\(°\) rotation?
 
The object takes a half rotation and the rotated figure looks like the following.
 
9 Ресурс 1.png
 
 
How will the object look like after a \(360\)\(°\) rotation?
 
The object takes a full rotation and the rotated figure looks exactly like the origin.
 
The rotated figure will look like this.
 
4 Ресурс 1.png