Problem related to a given diagram

Question

I came across the above problem but do not know how to tackle it. Can someone point me in the right direction? Thanks in advance for your time.

Answer 1

How many squares are there on each side of the line?

How many squares are there all together?

Which of the four given equations is related to this?

Answer 2

Look at the no. of squares in one triangle. Express the total no. of squares in some form using it.