Assuming the table is circular and not square or rectangle.
C=pi*D
So C= 3.1415926535897932384626433832795 * 4 = 12.566370614359172 ft.
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A table which is 90 inch around its outside (circumference) is 28.648 inches (to 3 dp) across (diameter).
If the table is circular, then its circumference is 18.845 (rounded) If it's not a circle, then the circumference can't be calculated knowing only the area.
The circumference of a circle that is 30 feet across is: 94.25 feet (diameter x Pi = circumference).
A circumference of 17.91 cm
Circumference = 72*pi