Can area of rectangle be greater than the square of its diagonal?

Q: A wall, rectangular in shape, has a perimeter of 72 m. If the length of its diagonal is 18 m, what is the area of the wall ?

The answer given to me is area of 486 m2. This is the explanation given to me
This is the explanation given to me

Is it possible to have a rectangle of diagonal 18 m and area greater than the area of a square of side 18 m ?

Answer

The area of the square built on the diagonal must be at least twice the area of the rectangle:

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Attribution
Source : Link , Question Author : user17838 , Answer Author : Théophile

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