Imagine an n-sided polygon with a side length of x, then perimeter = nx.
If sides are reduced to x/2 the perimeter becomes nx/2, ie it is halved.
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The length of each side, when added together, forms the perimeter.
perimeter of a rectangle is 20 on each side
Each side is 0.25m
If the perimeter of a square building is 812 meter then each side is 203 meter long
L is side length so perimeter is 4L. If L is tripled the perimeter becomes 4 x 3L = 12L, so perimeter is also tripled.