Think of covering the top of a table, that is a “plane”. If the table has sides and one wants to cover the sides, that is a different “plane”. The principle here is that a single piece of fabric is to be cut so that it will cover an individual plane. This is why we use one piece of fabric is used on the face of a sign or the deck of an awning, and another separate piece for the sides, etc. Using this principle, it makes it easy to deduce the amount of fabric required to do the job (for estimating purposes) and for placement into the structure during production.
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