All sides of the squares are congruent. This means that when solving for area:
base x height
the base and height would be the same length, 6.25
Multiply
6.25 x 6.25 = 39.0625
39.0625 ft² should be your answer (if i'm thinking of significant digits correctly)
If it should be a whole number, then 39 ft² is your answer
hope this helps
Starting with a different number changes the diagram because if you started with any other number, you would get different results.
The reciprocal is the flipped value so it will be11/9
18x/18 = 2/3 • 18
Flip reciprocal of 18 which is 1/18 so it would be 2/3 • 1/18 the 2 and 18 can be simplified when cross multiples so it would then be 1/3 • 1/9 which is x=1/27