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AB = a, AC = b (a and b as vector) and AD = pAB, AE = qAC (p and q as constant)

3 = (3/4 a + q/4 b)*(3p/4 a + 1/4 b)
= 3(1-pq)/16 a*b
where * represents the outer product and thus a*a = b*b = 0, b*a = -a*b.
The area required here can be written as (1-pq) a*b and it's 16.
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