the perimeter of a rectangle of length(x+y)cm and width (x-y)cm is:
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length = x+y cm
width = x-y cm
perimeter = (x+y)+(x+y)+(x-y)+(x-y)
=2(x+y) + 2(x-y)
=2x + 2y + 2 x - 2y
=4x + 2y - 2y
= 4x cm
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