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It depends on what side is being decreased

All rectangles have perimeter 2l+2w where l is the length and w is the with if the length is decreased by 1 then the rectangle will have perimeter 2(l-1)+2w, similarly if the with is decreased by 1 then it will have perimeter 2l+2(w-1).

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Q: How does the perimeter of rectangle change when the length of side is decreased by 1 unit?
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