Question 939424
Given that the Area is 72sq ft
To find all possibke dimensions, let's find all possible multipliers of 72 i.e
1, 2,3,4,6,8,9,12,18,24,36,72

The possible dimensions then become  (l,b)
(72,1)
(36,2)
(24,3)
(18,4)
(12,6)
(9,8)

Note the the product of the two dimension is always 72 and are integers

QED