First let's calculate the area of the big and small rectangles.
The big has sides of 7.5 and 9, and the small has sides of 3 and 3, so we have:
[tex]\begin{gathered} A_1=7.5\cdot9=67.5 \\ A_2=3\cdot3=9_{} \end{gathered}[/tex]
Now, let's calculate the intersection area between the rectangles. It will be a small square, with sides equal to 1.5
