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Area = A
A = (4 + x)(2 + x + y)
A = 8 + 4x + 4y + 2x + x^2 + xy
A = x^2 + xy + 6x + 4y + 8
perimeter = P
P = 2(4 + x) + 2(2 + x + y)
P = 8 + 2x + 4 + 2x + 2y
P = 4x + 2y + 12
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