Thank u
But how do u know which line is similar to the other line

What other line are you referring to?:-)

I mean like generally how do you know that ba similar to qp

Ohh basically you just have to look at it in a different view since ABCD is slightly rotated. If you see it clearly, each sides of the quadrilateral has its own angles which is similar to the other:-) And also, the question stated ABCD is similar to PQRS already, so you can rotate the quadrilateral to align ABCD the points to PQRS. For starters, you can take a look at the lines which i say its similar to each other, and try to see if you can see it too. There is no official working to say exactly which side is similar to which side:-/ hope this helps!

Ok thanks!!