How to calculate the perimeter or girth of rectangular building with a set-back
A rectangular plan of a building with the length = 20,000mm and width = 9,000mm and wall thickness of 300mm. It important to first note if the dimensions for a drawing are given from “out-to-out” or “in-to-in”. The formula for finding the Girth is 2(L + W) ± 4(T) + 2r
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