There are a set of lines on each court that dictate the boundary lines. For doubles, during the serve, the boundaries are the widest at the sides and short at the back (the innermost lne), and after the serve, it's full court, meaning the boundaries expand to the all of the outermost lines. For singles, from serve to game start, the boundaries will remain the same - the sidelines are the innermost lines and the back line is the outermost line.
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The size for a badminton net is 5 feet in the center and 5 feet and 1 inch at the poles.