Hi

Let x represent the constant of proportionality

A = Lw = 2x(x/2) = x^2 = 144,  x = 12   (Tossing out the negative solution for unit measure)

Dimensions are: 24in by 6in

CHECKING our answer***

(24in)(6in) = 144in^2

Wish You the Best in your Studies.

 

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