see the attached figure,
here if area = a = 2xy
we have r2 = x2 + y2
or we can have it as
a2 = 4r2x2 - 4x4
differentiatin wrt to x, nd then equating da/dx = 0, u'll get the value of x, nd then on substituting it for a, u'll get the value of a
its exactly the same as ur previous one... so m nt solving it whole, as its time taking, do knock again, if u find any prob 
!!!
Moderation Team
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