A 21 foot boat refers to the length of the boat.
There is not comparison between length and width. It could be narrow as on narrow boats or wide as in sea faring boats,
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None. A lineal foot has length but no width (or depth or height).
12in
A lineal foot is the same as a foot. It is a measure of length and has no width at all.
a foot measure at clarks is wat they usually do
Because the width of the cutting area is 21".