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>area = s - 2*integral from 0 to s/2 of {dY/sqrt(1+tan^2(A)*sin^2(Y)}
Sorry, but your formula *doesn't* have the correct limiting value for
small s. In the small s limit the expression above approaches
area = (s^3)/8
(which is dimensionally impossible). But the correct limiting
formula for the small s area is
area = (sqrt(3)/4)*s^2 .
Also, when the side length s is small A *does* not go to zero; it
goes to 60 deg (whose squared tangent is 3).