Theory:

Two figures are similar if every side or angle is proportional to the corresponding side or angle of the other figure.
Consider the examples.
 
shutterstock_1641971890.jpg shutterstock_1641971890.jpg
 
The above two fish tanks are the same, but their sizes are different.
 
shutterstock_1671093289.jpg shutterstock_1671093289.jpg
 
Similarly, the two refrigerators are the same, but their sizes are different.
 
Hence, we can conclude that two objects are similar if they are of the same shape but not necessarily of the same size.
 
In this session, we shall learn the concept of similar triangles and their application in real life.