The area of a square is s^2.
Let’s do the larger one first
(3^3)^2
Exponents
(27)^2
Exponents
729
The area of the larger (red) square is 729.
Now for the smaller one:
(2^3)^2
Exponents
(8)^2
Exponents
64
The area of the smaller (green) square is 64.