The perimeter of a rectangle is just the sum of the lengths of its sides, so taking half of each of the sides would make the total half of its original value also. Hope it helps.
When the length of a rectangle is shortened, the perimeter decreases since the length directly affects the total perimeter. Keeping the width constant while reducing the length will result in a smaller total perimeter. For instance, reducing a rectangle's length from 10 units to 6 units decreases its perimeter from 30 units to 22 units.
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