It is 2*(Length + Width).
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20ft is the perimeter.
If the table is a circle and the perimeter is 40 feet, then the diameter (rounded to 2 decimal places) would be 12.74 circumference = diameter x pi so, diameter = circumference / pi
The greatest perimeter is achieved by arranging the 36 tables in a long line: a 1 x 36 pattern has a perimeter of 74 table widths. Great for seating lots of people but no good for socialising - try talking to someone who is 35 seats away!
perimeter.
60"+60"+40"+40"=200" 60"=5' 200"=16'8" 60"+60"+48"+48"=216" 60"=5' 48"=4' perimeter=216" or 18'