Let the sides be a -b , a , a+b
as the tringle is right angled so (a-b)^2 + a^2 = (a+b)^2
or a^2-2ab + b^2 + a ^2 = a^2 + 2ab + b^2
or a^2= 4ab
or a= 4b
as the triangls is right angled so aea = \frac{1}{2} a(a-b) = \frac{1}{2} 4b(4b-b) = 6b^2 = 24 or b= 2
the smallest sde = 3b = 6.
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